# Changelog

All notable changes to the `l3kernel` bundle since the start of 2018
will be documented in this file.

The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
this project uses date-based 'snapshot' version identifiers.

## [Unreleased]

## [2026-08-10]

### Changed

- Integrate `l3backend` files into `l3kernel` distribution

## [2026-08-02]

### Added

- `raw` export format for `\color_export:nn(n)N` (see issue \#1934)
- Basic HiTeX support: names for new primitives, engine and format detections
- `\sys_if_engine_hitex:(TF)`
- `\sys_if_engine_unicode:(TF)`
- `\sys_if_output_hnt:(TF)`
- Support for loading `hitex` backend

## [2026-07-20]

### Fixed

- Parsing of numeric region subtags in `\text_bcp_parse:n` (fixes \#1936)

## [2026-06-19]

### Changed

- Set `\current@color` from `\color_select:N`, etc.

## [2026-06-18]

### Fixed

- Loop with invalid input for `\text_bcp_parse:n` (see issue \#1929)

## [2026-05-26]

### Added

- Symbolic support for variadic functions (issue \#1306)

### Changed

- Extend docs for `\keys_if_exist:n(TF)` (see issue \#1902)
- Anticipate ranges in catcode-in-class mode (issue \#1903)

### Fixed

- Nested inheritance of key defaults (issue \#1901)

## [2026-05-15]

### Changed

- Update `T` and `B` pole adjustments to mitigate incorrect pole selection
  in deeply-nested or self-joined coffins (issue \#445)

## [2026-04-28]

### Added

- `\c_max_intarray_int`

### Changed

- Remove `\@setfontsize` in `\text_expand:n`
- Support Japanese input for string conversion in upTeX (issue \#1880)
- Update function variant generators to handle inputted variants that are
  identical to its base form (issue \#1038) 

## [2026-03-20]

### Added

- `en`-type variants of `\text_...case:nn`

### Changed

- Adjust internal expansion in case functions to support `biblatex`
  (transitional measure)

## [2026-03-16]

### Added

- `\box_(g)frame:Nnn` and `\box_(g)underline:Nnn`
- `\vbox:w`, `\vbox_top:w`, `\vbox_center:w` and their `:nw` and `_to_ht:nw`
  versions
- Debugging switch `check-assertions`, `\debug_assert:nN(n)`, and `\debug_assert:nn(n)`
  (issue \#1840)

### Changed

- Apply `\text_declare_purify_equivalent:Nn` to commands immediately following
  `\protect`
- Adjust `\vbox_center:nn` to give identical dimensions to `\vcenter`

## [2026-02-18]

### Added

- `\coffin_pole:Nn`
- `\dim_horizontal:(n|N|c)` and `\dim_vertical:(n|N|c)`
- `\keyval_map_inline:nnn`, `\keyval_map_break:`, and `\keyval_map_break:n`
- `\msg_expandable_error:nneee` and related `e`-type variants
- `\vbox_center:n`, `\vbox_center:nn`, `\vbox:nn` and `\vbox_top:nn`
- `\vbox_top_to_ht:nn` and `\vbox_center_to_ht:nn`
- `\opacity_begin:n`/`\opacity_end:` and fill/stroke versions
- Efficient `v`-type variants for `\dim_compare:nNn(TF)` and
  `\int_compare:nNn(TF)`
- `\text_bcp_parse:n`

## [2026-01-19]

### Fixed

- Implementation of `\tl_if_regex_match:nN(TF)` (issue \#1836)

## [2026-01-10]

### Fixed

- Usage of logical AND (`&&`) in `l3fp` inside alignments (see issue
  \#1833)

## [2025-12-29]

### Changed

- Further improvements to rescanning in LuaTeX

## [2025-12-24]

### Fixed

- Rescanning of `\q_mark` in LuaTeX (issue \#1825)

## [2025-11-14]

### Fixed

- Fix `\peek_regex_remove_once:nTF` and `\peek_regex_remove_once:NTF` on
  reinserting special token `{` or `}` (issue \#1805)

## [2025-11-06]

### Changed

- Support `\exp_stop_f:` in text expansion
- Update mediabox management for LaTeX 2025-11-01

## [2025-10-24]

### Changed

- Adjust support for deprecated `\l_keys_choice_tl`

## [2025-10-09]

### Changed

- Set `\tex_showstream:D` to a non-negative value

### Deprecated

- `\l_keys_choice_tl` replaced by `\l_keys_choice_str`

## [2025-09-02]

### Changed

- Add trailing periods to `runsystem(...)` message for LuaTeX (see issue
  latex3/latex2e/\#1008)
- Use Lua parser in lua-uni-algos to parse Unicode data files for LuaTeX.

## [2025-08-13]

### Fixed

- Grapheme splitting for multibyte chars in pdfTeX (issue \#1782)

## [2025-07-20]

### Added

- `\tl_retokenize:n`
- Support for key value expansion in `l3keys`

### Changed

- Track LuaMetaTeX changes in `\meaning` output

## [2025-07-19]

### Fixed

- Treat active chars as control sequences when breaking text into words

## [2025-07-11]

### Fixed

- Exclude math mode from word/grapheme mapping (issue \#1773)

## [2025-06-30]

### Added

- `\text_declare_(lower|title|upper)case_exclusion:n`
- `\text_map_tokens:nn` and `\text_words_map_tokens:nn`
- Module `l3str-format`, moved from `l3experimental` to stable status

## [2025-06-09]

### Fixed

- Implementation of `\iow_show:n`

## [2025-05-26]

### Added

- `\sys_finalize:`

### Changed

- Print `added`/`updated` info only after 2020-02-02

### Deprecated

- `\sys_finalise:` in favor of `\sys_finalize:`

### Fixed

- Expansion of `\file_input_raw:n` with engines other than LuaTeX

## [2025-05-19]

### Added

- Support for the Oklab and Oklch color models
- `\iow_show:n` (issue \#1532)
- `\token_if_control_symbol:N(TF)` and `\token_if_control_word:N(TF)`
- `\regex_if_match:(N|n)n(TF)` to replace `\regex_match:(N|n)n(TF)`

### Changed

- Preserve `intarray` variables across multiple dumps (issue \#1597)
- Adjust `\tl_(g)set_rescan:Nnn` to support LuaMetaTeX

### Deprecated

- `\regex_match:(N|n)n(TF)`

### Fixed

- Interaction of `.initial:n` and `.inherit:n` key properties (issue \#1738)
- Multi-level key inheritance with explicit keys at intermediate levels
  (issue \#1739)

## [2025-04-29]

### Fixed

- Support for LuaMetaTeX in generic mode (issue \#1702)

## [2025-04-14]

### Added

- Module `l3benchmark`, moved from `l3experimental` to stable status
- Module `l3opacity`, moved from `l3experimental` to stable status

### Fixed

- Filter out `\bgroup`/`\egroup` in `\text_purify:n`
- Inherit keys recursively (issue \#1720)

## [2025-03-26]

### Added

- Module `l3graphics`, moved from `l3experimental` to stable status

### Fixed

- Correct scope for `\prg_gset_conditional:Nnn`

## [2025-03-10]

### Added

- `\text_words_map_function:nN`
- Variants `\tl_head:e` and `\tl_tail:e`
- `l3tl` functions (and variants) which trim spaces from only one side
  (issue \#1673):
  - `\tl_trim_left_spaces:n`, `\tl_trim_left_spaces_apply:nN`,
    `\tl_(g)trim_left_spaces:N`
  - `\tl_trim_right_spaces:n`, `\tl_trim_right_spaces_apply:nN`,
    `\tl_(g)trim_right_spaces:N`

### Changed

- `\fp_set_function:nnn` and `\fp_set_variable:nn` now raise errors on
  undefined (fp) identifiers (issue \#1700)

### Fixed

- Avoid low-level error if keys are given without a module (issue \#1254)

## [2025-01-18]

### Changed

- Use a dedicated internal marker for `fp` and `int` expressions, allowing use
  with LuaMetaTeX (see \#1518)

### Fixed

- Missing trailing period in `\tl_analysis_log:(N|n)` output (see \#1663)
- Some state variables weren't correctly reset by `\keys_define:nn` and
    `\keys_set:nn` breaking some nested usages in edge cases

## [2025-01-14]

### Added

- `\int_step_tokens:nn`, `\int_step_tokens:nnn`, and `\int_step_tokens:nnnn`

### Deprecated

- `\sys_if_timer_exist:(TF)`

### Fixed

- Check conditionals are defined when creating variants (see \#1189)

## [2024-12-25]

### Added

- `\file_forget:n`

### Changed

- Expand 'value(s)' arg. to `\color_select:nn`, `\color_set:nnn`, etc. (see
  \#1640)

### Fixed

- Initialize color `.` properly (see \#1642)

## [2024-12-09]

### Added

- `\bitset_use:N` and `\clist_use:N`: this clarifies that bitsets and clists
  can be used with `V`-type expansion
- `\sys_if_engine_opentype:(TF)`
- Add equivalent interfaces for regex functions:
  - `\int_(g)set_regex_count:Nnn`, `\int_(g)set_regex_count:NNn`
  - `\seq_(g)set_regex_extract_once:Nnn`, `\seq_(g)set_regex_extract_once:NNn`
  - `\seq_(g)set_regex_extract_all:Nnn`, `\seq_(g)set_regex_extract_all:NNn`
  - `\seq_(g)set_regex_split:Nnn`, `\seq_(g)set_regex_split:NNn`
  - `\tl_if_regex_match:nn(TF)`, `\tl_if_regex_match:nN(TF)`
  - `\tl_regex_(g)replace_once:Nnn`, `\tl_regex_(g)replace_once:NNn`
  - `\tl_regex_(g)replace_all:Nnn`, `\tl_regex_(g)replace_all:NNn`

### Fixed

- `\prop_item:Nn` result not returned in `\exp_not:n` for linked properties
  (see \#1630)

### Removed

- `\c_catcode_active_tl`: was missing a `_`, always intended to be internal

## [2024-11-02]

### Added

- `V`-type variant for all `\<var>_set:Nn` functions

### Fixed

- Error detection in coffin code (see \#1580)

## [2024-10-09]

### Added

- `\coffin_ht_plus_dp:(N|c)`

### Fixed

- Use TU-encoding with lualatex and xelatex in `l3doc`
- Inconsistent local/global assignments in `l3doc` (see \#1593)

## [2024-09-10]

### Changed

- Increase outdent of long function names in `l3doc` (issue \#1585)

### Fixed

- `\seq_map_pairwise_function:NNN` not work with `\seq_map_break:(n)` (issue \#1587)

## [2024-08-30]

### Changed

- Reduce memory usage when building Unicode data storage
- Avoid recursive doc for `\file_if_exist:n(TF)` (issue \#1573)

### Fixed

- Handling of `ltcmd` newlines (`\obeyedline`) in `l3doc` (issue \#1577)

## [2024-08-16]

### Added

- Add quark (`\q_`) and scan mark (`\s_`) prefixes to naming scheme
  (issue \#1565)

## [2024-07-20]

### Fixed

- Implementation of deprecated `\tl_mixed_case:n(n)`
- Redo the fix for LaTeX2e key properties (issue latex3/latex2e\#1415)

## [2024-06-19]

### Fixed

- Avoid a low-level error when LaTeX2e key properties are given without a value

## [2024-05-27]

### Added

- Syntax entries of `\keys_set_groups:nnn(n)N`

### Fixed

- `\peek_analysis_map_inline:n` with active spaces (issue \#1539)

## [2024-05-08]

### Added

- Full set of variants for `\prop_(g)put_if_not_in:Nnn`
- `\keys_set_groups:nnn(n)N` to match `\keys_set_exclude_groups:nnn(n)N`

### Fixed

- Implementation of deprecated `\pdf_object_write:nn`

## [2024-04-11]

### Added

- `\prop_(g)put_if_not_in:Nnn` (renamed from `\prop_(g)put_if_new:Nnn`)
- `\intarray_if_exist:N(TF)`
- `\fparray_if_exist:N(TF)`
- Support for 'indexed' PDF objects

### Changed

- Expand object names in `\pdf_object_...` functions (issue \#1521)
- Adapt `l3doc` for `ltcmd` change to handling of newlines
  (see latex3/latex2e\#1304)
- Return active spaces from `\sys_get_query:n(nn)N` (issue \#1529)

### Fixed

- False `debug` error raised by `\cctab_const:Nn` (issue \#1508)
- Undefined `\__kernel_iwo_open:Nn` used in `\iow_shell_open:Nn`
  (issue \#1515)
- Naming of register functions in LuaMetaTeX 2.11+ (issue \#1518)
- Catcode applied to letters by `\sys_get_query:n(nn)N`

### Deprecated

- `\prop_(g)put_if_new:Nnn` (renamed to `\prop_(g)put_if_not_in:Nnn`)

## [2024-03-14]

### Added

- Macro interface for `l3sys-query`

### Changed

- Require that `expl3` is loaded at top level in generic mode
- Ensure that the dimension arguments to `\box_autosize_to_...:Nnn`
  are properly formed (issue \#1502)

### Fixed

- Typeset `TF` of internal conditionals in current color (issue \#730)
- Some functions and variables were defined locally

## [2024-02-20]

### Changed

- Improve error recovery when an invalid `prop` is used (PR \#1464)

### Fixed

- Restore `\__kernel_msg_...:nnx(xx)` for older `xparse` support
- Prevent an infinite loop in `\debug_(on|off):n` (issue \#1442)
- Require `\sys_ensure_backend:` is used in the preamble (issue \#1442)

## [2024-02-18]

### Changed

- Work-around to enable `\prop_set_from_keyval:Nn`, etc., to avoid an error if
  `prop` is not already defined

### Fixed

- Extend debug checking to cover `\prop_(g)set_from_keyval:Nn`

## [2024-02-13]

### Added

- Checking missing `\endgroup` at the end of `\DocInclude`
- Linked storage type for large property lists (issue \#1040, pull \#1059)

### Changed

- `\meta` now typesets in `\texttt`, along with `\Arg`
- Improved the performance of `\cs_if_exist:NTF`, `\cs_if_free:NTF`,
    `\cs_if_exist_use:NTF`, and most notably their `c`-type variants.

### Fixed

- Inconsistent local/global assignments in `\vcoffin_gset:Nnn` and
  `\vcoffin_gset:Nnw`
- Tokenization by `\peek_analysis_map_inline:n` of one additional
  character after any space or brace

### Deprecated

- `\msg_gset:nnn(n)`

## [2024-01-22]

### Added

- `\keys_set_exclude_groups:nnn(nN)` to replace `\keys_set_filter:nnn(nN)`
- Flags with N-type names, like other variable types

### Changed

- Set `l3doc` option `kernel` off as-standard (issue \#1403)
- Moved `\seq_set_filter:NNn` to stable

### Deprecated

- `\keys_set_filter:nnn(nN)` in favor of  `\keys_set_exclude_groups:nnn(nN)`

## [2024-01-04]

### Added

- Documentation for `\bitset_show_named_index:N` (issue \#1372)
- `\bitset_log_named_index:N`
- `\tl_build_get_intermediate:NN`
- Support for `.default:n` values for the `unknown` handler (see issue \#67)

### Changed

- Improved method to suppress `l3bitset` where required
- Clarify behavior of `\tl_if_novalue:n(TF)` (see issue \#1402)

### Deprecated

- `\tl_build_get:NN` in favor of `\tl_build_get_intermediate:NN`

### Fixed

- Handling of `documented-as` variants in `l3doc` indexing
  (see issue \#1345)
- Missing trailing `TF` in single variant of conditional functions (issue \#1398)

## [2023-12-11]

### Changed

- Use keyval handler for `l3doc` class options

### Fixed

- Support for deprecated `pdf` module functions (issue \#1373)
- Generate stub `l3bitset` for transitional support

## [2023-12-08]

### Added

- `\c_empty_str` (issue \#1361)
- `l3bitset`: moved from `l3experimental`

### Fixed

- Return `str` (not `tl`) in `\bool_to_str:N` and `\bool_to_str:n` (issue \#1331)
- Catcode of space from `\str_set_convert:Nnnn` (issue \#1344)
- Tidy up various documentation issues (issue \#1345)

## [2023-11-09]

### Added

- Documentation for `\c_nan_fp`
- `\str_case_e:en(TF)`

### Changed

- Speed up `\str_(g)set:Nn`, `\str_const:Nn`, `\str_(g)put_left:Nn`,
  and `\str_(g)put_right:Nn`

### Fixed

- Normalization of `.inherit:n` key data (issue \#1314)

## [2023-11-01]

### Added

- `\seq_(g)set_map_e:NNn`
- Documentation for `\ExplLoaderFileDate` in `expl3.pdf`

### Changed

- Documentation improvements
- Refine action of `\text_titlecase_first:n(n)` to be focussed strictly on
  first (relevant) codepoint in the input
- Standardize "This is the (e)TeX primitive ..." in `texnote` in documentation
- Move `\tl_build_(g)begin:N`, `\tl_build_(g)end:N`, `\tl_build_(g)put_left:Nn`
  and `\tl_build_(g)right:Nn` to stable status

### Deprecated

- `\seq_(g)set_map_x:NNn` in favor of `e`-type naming

### Fixed

- `\fp_clear_variable:n` should act locally (issue \#1298)
- `\fp_clear_function:n` should act locally and correctly
- Support for `\fp_show:N` showing symbolic expressions (issue \#1301)
- Undefined `\str_case:en(TF)` (excluding `\str_case:en`)

## [2023-10-23]

### Added

- `\text_titlecase_all:n(n)`
- `\token_to_catcode:N`
- Support for symbolic variables in fp input:
  `\fp_new_variable:n`, `\fp_set_variable:nn` and `\fp_clear_variable:n`
- Support for user-defined functions in fp expressions:
  `\fp_new_function:n`, `\fp_set_function:nnn` and `\fp_clear_function:n`

### Changed

- Clarify action of `\text_titlecase_first:n(n)`
- Detect letters for titlecasing based on Unicode general category

### Deprecated

- `\text_titlecase:n(n)` as ambiguous: replaced by `\text_titlecase_all:n(n)`
- `\tl_build_(g)clear:N` in favor of `\tl_build_(g)begin:N`

### Fixed

- Support arbitrary BCP-47 locales for case-changing overrides (issue \#1239)
- Retain braces when ending titlecasing with some input structures

## [2023-10-10]

### Added

- `\iow_shipout_e:Nn`
- Documentation for `\sys_if_timer_exist_p:` and `\sys_if_timer_exist:(TF)`.
  They were supported since l3kernel 2021-05-25, along with `\sys_timer:`.
- l3doc.dtx: Support for footnotes in the function and variable environment
- Variants `\tl_if_single:c(TF)` and `\tl_if_single_p:c` (issue \#1272)
- Key properties `.str_(g)set_e:N` and `.tl_(g)set_e:N`

### Changed

- Switch generally from `x`- to `e`-type variants
- Convert `\file_if_exist:n(TF)` to expandable status,
  adding predicate version
- Standardize variants for `\prop_(g)pop:NnN(TF)`
- Standardize variants for `\prop_(g)put:Nnn`
- Standardize variants for `\prop_(g)put_if_new:Nnn`
- Standardize variants for `\prop_(g)remove:Nn`

### Deprecated

- `\iow_shipout_x:Nn` in favor of `e`-type naming
- Key properties `.str_(g)set_x:N` and `.tl_(g)set_x:N`

### Fixed

- Rare rounding error in divisions (issue \#1264)

## [2023-08-29]

### Added

- `\c_sys_timestamp_str`

### Changed

- Rename `\tex_pdfcreationdate:D` to `\tex_creationdate:D`

## [2023-08-11]

### Changed

- Wrap long lists of variants in `l3doc` display of functions (issue \#1258)

### Fixed

- Revert 'Allow for implicit chars when case changing' (issue \#1260)

## [2023-08-03]

### Added

- `\tex_XeTeXhyphenatablelength:D`, `\tex_XeTeXinterwordspaceshaping:D`,
  `\tex_XeTeXselectorcode:D`
- Several missing `\tex_<name>:D` primitives from LuaTeX and (up)TeX

### Changed

- `\tex_protrudechars:D` now defined for XeTeX (to `\XeTeXprotrudechars`)
- Allow for optional `v` in version string argument to
  `\ProvidesExpl...`

### Fixed

- Allow for implicit chars when case changing

## [2023-06-30]

### Added

- `\codepoint_to_category:n`

### Changed

- Drop notes about slow `\expanded` emulation. `\expanded` is required since
  release 2023-05-15
- Sync engine/primitive requirements in `expl3.dtx` with code and README

### Fixed

- Case changing of Greek characters with complex NFD representation (issue \#1236)
- Error recovery when wrongly applying abs to a tuple (issue \#1238)

## [2023-06-16]

### Changed

- Exclude entries in `\l_text_case_exclude_arg_tl` from expansion in `\text_expand:n`
  (latex3/latex2e\#904)
- Generate _dialytika_ if appropriate when uppercasing Greek words starting with a
  vowel taking a breathing mark (issue \#1228)
- Retain stress diacritics when uppercasing Greek (issue \#1230)
- Expand (partial) paths in `\l_file_search_path_seq` and `\input@path`
  (see latex3/latex2e\#1086)

## [2023-06-05]

### Added

- `\cctab_gsave_current:N`, `\g_tmpa_cctab` and `\g_tmpb_cctab` (issue \#1089)
- `\prg_gset_eq_conditional:NNn` (issue \#1212)
- `\iow_shell_open:Nn` (issue \#1122)

### Deprecated

- `\tl_case:Nn(TF)`
- `expl3` package option `enable-debug` (no longer required)

### Fixed

- Set `\l_keys_value_tl` in `.initial:n` (issue \#1013)
- Support for boolean values in `expl3` package options
  `check-declarations` and `log-functions` (issue \#978)
- Allow for optional `/` at end of `\input@path` entries
  (see latex3/latex2e\#1076)

## [2023-05-22]

### Added

- Rounded out the `\use_i:nn...` functions to cover all cases taking
  one argument from up to nine arguments
- `\coffin_(g)reset_poles:N`
- `\dim_to_decimal_in_<unit>:n`, for `<unit>` types
  `cc`, `cm`, `dd`, `in`, `mm` and `pc`
- `\file_input_raw:n`
- `\int_if_zero:n(TF)`
- `\str_mdfive_hash:n`

### Changed

- Remove `\noexpand` inside math mode in `\text_expand:n`
- Re-implement `\dim_to_decimal_in_bp:n` and
  `\dim_to_decimal_in_unit:nn` to be re-entrant (issue \#954)

### Fixed

- Omit `0123456789` from URL escaping (issue \#838)
- Leave implicit chars unchanged in `\text_expand:n` (issue \#874)
- Filtering/grouping applied to meta keys (issue \#940)
- Issue correct error message if `bool` key is set
  incorrectly using `.initial:n` (issue \#1013)
- Set `\l_keys_key_str` in `.initial:n` (issue \#1013)
- Handling of implicit chars in `\text_purify:n` (issue \#1208)

## [2023-05-15]

### Changed

- Require `\expanded` and 'pdfTeX extension' primitives,
  and thus TeX distributions from mid-2019 onward

### Fixed

- Treatment of trailing `/` in `\input@path`

## [2023-05-11]

### Added

- `\seq_map_pairwise_function:NNN` (renamed from  `\seq_mapthread_function:NNN`)

### Changed

- Moved `\seq_set_item:Nnn` to stable status
- Track seen filenames to improve performance of
  `\file_full_name:n` and dependent file operations

### Removed

- Experimental function `\seq_pop_item:NnN` from `l3candidates`
- Experimental function `\seq_mapthread_function:NNN` now renamed
  `\seq_map_pairwise_function:NNN`

## [2023-05-05]

### Added

- `\bool_case:n(TF)` (renamed from  `\bool_case_true:n(TF)`)
- `\flag_ensure_raised:n` (renamed from `\flag_raise_if_clear:n`)
- `\iow_wrap_allow_break:` (renamed from `\iow_allow_break:`)

### Changed

- Moved to stable status:
  - `\bool_(g)set_inverse:N`
  - `\c_catcode_active_space_tl`
  - `\c_sys_engine_version_str`
  - `\exp_args_generate:n`
  - `\fp_if_nan:n(TF)`
  - `\ior_get_term:nN` and `\ior_str_get_term:nN`
  - `\ior_shell_open:Nn`
  - `\msg_show_item:n`, `\msg_show_item_unbraced:n`,
    `\msg_show_item:nn`, `\msg_show_item_unbraced:nn`
- Require random number support from engine

### Removed

- Experimental functions from `l3candidates`:
  - `\bool_case_false:n(TF)`
  - `\intarray_gset_rand:Nn(n)`
  - `\intarray_to_clist:N`
  - `\peek_catcode_collect_inline:Nn`, `\peek_charcode_collect_inline:Nn` and
    `\peek_meaning_collect_inline:Nn`
  - `\prop_rand_key_value:N`
  - `\seq_set_from_function:Nnn` and `\seq_set_from_inline_x:Nnn`
  - `\sys_if_rand_exist:(TF)`
  - `\tl_range_braced:Nnn` and `\tl_range_unbraced:Nnn`
- Experimental functions now renamed
  - `\bool_case_true:n(TF)` (now `\bool_case:n(TF)`)
  - `\flag_raise_if_clear:n` (now `\flag_ensure_raised:n`)
  - `\iow_allow_break:` (now `\iow_wrap_allow_break:`)
- Experimental functions moved to kernel-internal:
  - `\msg_log_eval:Nn` and `\msg_show_eval:Nn`

## [2023-04-20]

### Changed

- Re-order arguments of `\text_declare_lowercase_mapping:nnn`,
  `\text_declare_titlecase_mapping:nnn` and
  `\text_declare_uppercase_mapping:nnn`

## [2023-04-19]

### Added

- `\box_set_clipped:N` and variants (renamed from `\box_clip:N`)
- `\text_declare_lowercase_mapping:nn(n)`,
   `\text_declare_titlecase_mapping:nn(n)`
   and `\text_declare_uppercase_mapping:nn(n)` to allow customization of
   case changing outcomes

### Changed

- `\box_set_trim:Nnnnn` and `\box_set_viewport:Nnnnn` moved to
  stable kernel

### Fixed

- Incorrect internal name in `\pdf_pagesize_gset:nn`

### Removed

- Experimental `\box_clip:N` and variants (renamed to
  `\box_set_clipped:N`)

## [2023-03-30]

### Added

- `\tex_endlocalcontrol:D` as expl3 name for the LuaTeX primitive

### Changed

- Allow non-integer values in color expressions
- Restrict color expressions values to the range [0, 100]
- Leave Greek spacing diacritics unchanged in uppercasing

### Fixed

- Fix minor version in `\c_sys_engine_version_str` for pdfTeX and LuaTeX
  (issue [\#1186](https://github.com/latex3/latex3/issues/1186))

## [2023-02-22]

### Changed

- More defensive approach in `\codepoint_to_nfd:n`

### Fixed

- CJK character handling for (u)pTeX (issue
  [\#1171](https://github.com/latex3/latex3/issues/1171))

## [2023-02-07]

### Changed

- Swap meaning of `el` and `el-x-iota` when case changing
  Greek: match traditional LaTeX approach

### Deprecated

- `\l_text_accents_tl` and `\l_text_letterlike_tl`

## [2023-02-02]

### Fixed

- Handling of multiple accents when uppercasing Greek
  (see LaTeX2e issue
  [\#987](https://github.com/latex3/latex2e/issues/987))

## [2023-02-01]

### Fixed

- Allow for expressions within color `RGB`/`HSB` input

## [2023-01-24]

### Added

- Complete list of pdfTeX primitives

### Changed

- Leave catcode of `&` unchanged in code environment

### Fixed

- Allow for multi-part BCP47 strings in case changing
- Loading with plain TeX due to `\outer` status of `^^L`
  issue ([\#1161](https://github.com/latex3/latex3/issues/1161))

## [2023-01-16]

### Added

- `\pdf_pagesize_gset:nn`

### Fixed

- Enable `\char_generate:nn` to create active tokens which are `\outer`
  or equal to `\fi`

## [2022-12-17]

### Added

- `\codepoint_to_nfd:n`
- `\codepoint_generate:n` and `\codepoint_str_generate:n`
- `\str_casefold:n`

### Changed

- Protect `babel` shorthands from expansion

### Fixed

- Appearance of `\DescribeOption` (issue
  [\#1111](https://github.com/latex3/latex3/issues/1111))

## [2022-11-02]

### Added

- `\prg_gset_conditional:N(p)nn` and
  `\prg_gset_protected_conditional:N(p)nn`

### Fixed

- Loading of `expl3` with ConTeXt MkIV (issue
  [\#1142](https://github.com/latex3/latex3/issues/1142))

## [2022-10-26]

### Changed

- Usage of `\exp_not:n`/`\exp_not:N` in `\peek_analysis_map_inline:n` output

### Fixed

- `\peek_analysis_map_inline:n` support for macro parameter characters (issue
  [\#1109](https://github.com/latex3/latex3/issues/1109)), for many expandable
  tokens (issue [\#1110](https://github.com/latex3/latex3/issues/1110)), and an
  esoteric case (issue [\#1113](https://github.com/latex3/latex3/issues/1113))
- Creation of a message with some engines (issue
  [\#1139](https://github.com/latex3/latex3/issues/1139))

### Deprecated

- `\char_to_nfd:N`, `\char_to_nfd:n`
- `\char_foldcase:N`, `\char_lowercase:N`, `\char_titlecase:N`,
   `\char_uppercase:N` and `str` variants
- `\char_to_utfviii_bytes:n`
- `\str_foldcase:n`

## [2022-09-28]

### Added

- Set media box for test phase documents

### Fixed

- Text case switching in `\text_titlecase_first:n` (issue
  [\#1130](https://github.com/latex3/latex3/issues/1130))

## [2022-08-30]

### Added

- `\pdf_object_new:n` and `\pdf_object_write:nnn` - support assignment of object
  type at point-of-writing (issue
  [\#1123](https://github.com/latex3/latex3/issues/1123))
- `\text_map_function:nN` and `\text_map_inline:nn` for mapping to
  graphemes in textual input
- Support for medieval Latin case changing
- `\char_to_nfd:n` to extend NFD support to 8-bit engines

### Deprecated

- `\pdf_object_new:nn` and `\pdf_object_write:nn`, in favor of
  `\pdf_object_new:n` and `\pdf_object_write:nnn`, respectively

## [2022-08-23]

### Added

- Shortened range of chars which are left unchanged when converted to
  strings with `\str_(g)set_convert:Nnnn`.
- `\color_if_exist:n(TF)`
- Support for case changing Vietnamese characters with 8-bit engines
- Parsing of `cmy`, `tHsb` and `&spot` color models to support data exchange with
  `xcolor`

### Changed

- Replace `LaTeX3` in message text by `LaTeX`
- Approach to setting current color data from LaTeX2e

## [2022-08-05]

### Added

- Support for case changing Croatian diagraph with 8-bit engines
- Support accent removal when uppercasing Greek with 8-bit engines
- Function `\sys_ensure_backend:`

### Fixed

- Behavior of `\color_math:nn` in alignments
- Expansion of text containing unterminated `\romannumeral` primitives

## [2022-07-21]

### Fixed

- `\iow_open:N` in ConTeXt MkII

## [2022-07-15]

### Fixed

- Correct argument order in `\text_case_switch:nnnn`

## [2022-07-14]

### Changed

- Improved approach to `\text_case_switch:nnnn` expansion

## [2022-07-04]

### Added

- `\text_declare_case_equivalent:Nn`, `\text_case_switch:nnnn` and
  related mechanism to allow specialization of case changing output
  for selected commands

## [2022-07-01]

### Added

- `\cs_parameter_spec:N`

### Changed

- `\text_expand:n` now acts on active chars to support legacy input encodings

### Deprecated

- `\cs_argument_spec:N`

### Fixed

- Correct validity check performed by `\regex_show:N` (issue [\#1093](https://github.com/latex3/latex3/issues/1093))
- Closing of file handles (issue [\#1105](https://github.com/latex3/latex3/issues/1105))

## [2022-06-16]

### Fixed

- Made `\peek_analysis_map_inline:n` alignment-safe (issue [\#1090](https://github.com/latex3/latex3/issues/1090))
- Setting a boolean to itself no longer errors (issue [\#1055](https://github.com/latex3/latex3/issues/1055))

## [2022-06-02]

### Changed

- Exclude only first mandatory argument of entries in
  `\l_text_case_exclude_arg_tl` from case changing

## [2022-05-30]

### Added

- Add `\lua_load_module:n`

### Fixed

- Typo in implementation of titlecase `hy-x-yiwn`
- Definition order issue with `\str_case:Nn(TF)`

## [2022-05-04]

### Added

- Language settings `hy` and `hy-x-yiwn` for handling of ech-yiwn ligature
  uppercasing

### Changed

- Support BCP 47 properly in case changer language argument

### Fixed

- Correct `el-xiota` and `de-xeszett` to `el-x-iota` and `de-x-eszett`

## [2022-04-29]

### Added

- Language setting `el-xiota` for retention of ypogegrammeni when uppercasing
  Greek

### Changed

- Rename case-changing variant `de-alt` to `de-xeszett` to align with
  `luaotfload`
- Allow for `\lccode`/`\uccode` changes in `\char_...case:n` functions

### Fixed

- Support for ypogegrammeni in case changing Greek (see issue [\#1088](https://github.com/latex3/latex3/issues/1088))

## [2022-04-20]

### Changed

- Collect some common code from `l3backend-color`

## [2022-04-10]

### Added

- `\keys_precompile:nnN` for conversion of keyvals to fast-to-apply token
  lists
- Missing `\str_if_empty:n(TF)` (see issue [\#1071](https://github.com/latex3/latex3/issues/1071))
- Missing `\str_case:Nn(TF)` (see issue [\#1071](https://github.com/latex3/latex3/issues/1071))
- `\tex_...:D` names for primitives added in TeX Live 2022

### Changed

- Definition of `\legacy_if:n(TF)` to support primitive conditionals
- `\str_<type>case:n` now case changes codepoints above 127 with all engines
- `\char_generate:nn` now also allows to generate category 10 tokens (spaces)
  except for char code 0

### Fixed

- Handling of 'misplaced' `\protect` by `\text_expand:n`
- Nesting of `\tl_analysis_map_inline:nn`
- Naming of an error message

## [2022-02-24]

### Changed

- Better support for `\cite`, _etc._, in case changing

## [2022-02-21]

### Fixed

- Use of `\@uclclist` for case changing

## [2022-02-05]

### Added

- Distribute `l3doc.pdf` with a prominent warning about future changes
- `\color_math:nn(n)` as a functional equivalent of the new `\mathcolor`
  command in LaTeX2e

### Changed

- Documentation for horizontal coffin poles (see issue [\#1041](https://github.com/latex3/latex3/issues/1041))
- Update primitive requirements to enable loading with Prote/HINT

## [2022-01-21]

### Changed

- Auto-generate legacy switch if required in `.legacy_set_if:n`
  key property

### Fixed

- Correct creation of `.if` property
- Handling of colors created in a group once they go out-of-scope

## [2022-01-12]

### Added

- Support for validity scope for keys
- `\peek_remove_filler:n`
- `\prop_to_keyval:N`
- `\regex_match_case:nn(TF)`, `\regex_replace_case_once:nN(TF)`,
  `\regex_replace_case_all:nN(TF)`

### Changed

- Policy change: functions will no longer be removed after deprecation,
  thus the Lua functions noted below are the _last_ 'stable' code to be
  removed from `l3kernel` after deprecation
- Allow indirect conversions between colorspaces through fallback models
- Move some color functions from `l3backend`

### Deprecated

- `\peek_..._ignore_spaces:N(TF)` functions
- `\sys_load_deprecation:`
- Option `undo-recent-deprecations`

### Removed

- Lua functions in `l3kernel` table

## [2021-11-22]

### Added

- Support for legacy `if` switches in `l3keys`

### Changed

- Documentation improvements
- Implementation of `intarray` data type with LuaTeX
- Better support for LuaMetaTeX

## [2021-11-12]

### Fixed

- DeviceN colorspace conversions with alternative model RGB

### Added

- `.str_set:N`, etc., key properties (issue [\#1007](https://github.com/latex3/latex3/issues/1007))
- `\bool_to_str:n` (issue [\#1010](https://github.com/latex3/latex3/issues/1010))

### Changed

- `\prop_..._from_keyval:Nn` functions now support active comma or
  equal sign (pull \#1012)

## [2021-10-18]

### Added

- Support for ICC-based color profiles
- `\color_profile_apply:nn`

## [2021-10-17]

### Changed

- Better DeviceN support

## [2021-10-12]

### Fixed

- Global assignments for `\box_gresize_to_ht_plus_dp:Nn`
  and `\coffin_gattach:NnnNnnnn`
- Conversion of DeviceN colors to device fallback

## [2021-08-27]

### Changed

- Formatting of expandable errors (issue [\#931](https://github.com/latex3/latex3/issues/931))
- Internal code for kernel messages

## [2021-07-12]

### Fixed

- Handling of multiple color models (issue [\#962](https://github.com/latex3/latex3/issues/962))

### Removed

- Functions marked for removal end-2020

## [2021-06-18]

### Fixed

- Local assignment to `\g__sys_backend_tl`
- Incorrect internal function name (issue [\#939](https://github.com/latex3/latex3/issues/939))
- Case-changing exceptions for (u)pTeX (issue [\#939](https://github.com/latex3/latex3/issues/939))
- Low-level error if accent commands are not followed by
  letter when case changing (see \#946)

## [2021-06-01]

### Fixed

- Loading when `\expanded` is not available

## [2021-05-27]

### Fixed

- Correctly detect local formats in `Mismatched LaTeX support files` error.

## [2021-05-25]

### Added

- `\msg_note:nnnnnn` (issue [\#911](https://github.com/latex3/latex3/issues/911))
- `\str_compare:nNnTF` (issue [\#927](https://github.com/latex3/latex3/issues/927))
- `\sys_timer:`
- `\prop_concat:NNN`, `\prop_put_from_keyval:Nn` (issue [\#924](https://github.com/latex3/latex3/issues/924))
- Functions to show and log various datatypes (issue [\#241](https://github.com/latex3/latex3/issues/241)):
  `\coffin_show:Nnn`, `\coffin_show:N`, `\coffin_log:Nnn`, `\coffin_log:N`,
  `\color_log:n`, `\group_show_list:`, `\group_log_list:`,
  `\ior_show:N`, `\ior_log:N`, `\iow_show:N`, `\iow_log:N`,
  `\tl_log_analysis:N`, `\tl_log_analysis:n`
- `\legacy_if_set_true:n`, `\legacy_if_set_false:n`, `\legacy_if_set:nn`
- Matching multiple regex at the same time (issue [\#433](https://github.com/latex3/latex3/issues/433)):
  `\regex_case_match:nn(TF)`,
  `\regex_case_replace_once:nN(TF)`,
  `\regex_case_replace_all:nN(TF)`

### Fixed

- Checking brace balance in all regex functions (issue [\#377](https://github.com/latex3/latex3/issues/377))
- Removing duplicates in clists when items contain commas (issue [\#917](https://github.com/latex3/latex3/issues/917))

### Changed

- Slight speed up in some elementary int/dim/skip/muskip operations and
  in setting tl or clist variables equal.
- Speed up mapping functions in l3clist, l3prop, l3seq, l3tl

## [2021-05-11]

### Added

- `\cctab_item:Nn` (issue [\#880](https://github.com/latex3/latex3/issues/880))
- `\clist_use:nnnn` and `\clist_use:nn` (issue [\#561](https://github.com/latex3/latex3/issues/561))

### Fixed

- Loading of backend in generic DVI mode (issue [\#905](https://github.com/latex3/latex3/issues/905))
- Make `\keyval_parse:nnn` alignment-safe (issue [\#896](https://github.com/latex3/latex3/issues/896))
- Control sequences and category codes in regex replacements (issue [\#909](https://github.com/latex3/latex3/issues/909))

### Changed

- Speed up `\group_align_safe_begin:` (pull \#906)

## [2021-05-07]

### Added

- Color export in comma-separated format
- `\ur{...}` escape in `l3regex` to compose regexes
- `\seq_set_split_keep_spaces:Nnn` (see \#784)
- `\seq_set_item:Nnn(TF)` and `\seq_pop_item:NnN(TF)`
- `\box_ht_plus_dp:N` (issue [\#899](https://github.com/latex3/latex3/issues/899))
- `\clist_map_tokens:nn`, `\clist_map_tokens:Nn`,
  `\str_map_tokens:nn`, `\str_map_tokens:Nn`

### Changed

- Use prevailing catcodes instead of string in regex replacement (issue [\#621](https://github.com/latex3/latex3/issues/621))
  (_Breaking change_)
- `\__kernel_file_name_sanitize:n` now uses a faster `\csname`-based
  approach to expand the file name
- Improved performance for basic conditionals
- `\pdf_version_gset:n` support for `dvips`
- Improve handling of `\exp_not:n` in `\text_expand:n` (issue [\#875](https://github.com/latex3/latex3/issues/875))
- `\file_full_name:n` now avoids calling `\pdffilesize` primitive multiple times
  on the same file
- Show printable characters explicitly in `\regex_show:n`
- Regex replacement now errors when using a submatch (`\1` etc) for which
  the regex has too few groups
- Showing complex datatypes now validates their internal structure (issue [\#884](https://github.com/latex3/latex3/issues/884))
- Indexing in l3doc: all page references before codeline references,
  improve target placement, solve pdfTeX and makeindex warnings

### Fixed

- Evaluate integer constants only once (issue [\#861](https://github.com/latex3/latex3/issues/861))
- Detect `\ior_map_inline:Nn` calls on undefined streams (issue [\#194](https://github.com/latex3/latex3/issues/194))

### Deprecated

- `l3docstrip` converted to a stub which simply loads DocStrip: use
   the latter directly

## [2021-02-18]

### Added

- `l3color`: Moved from `l3experimental`
- `l3pdf`: Moved from `l3experimental`
- `default` alias to str_convert

### Changed

- Re-ordered `interface3` documentation
- Moved `msg_show:nn(nnnn)` to stable

## [2021-02-06]

### Changed

- Use new (internal) interface for kerns

## [2021-02-02]

### Added

- `\c_zero_str`

## [2021-01-09]

### Added

- `\keyval_parse:nnn`

### Changed

- `\keyval_parse:NNn` is set equal to `\keyval_parse:nnn`

### Fixed

- Handling of encoding-specific commands in `\text_purify:n`

## [2020-12-07]

### Fixed

- `\peek_analysis_map_inline:n` with spaces and braces

## [2020-12-05]

### Fixed

- Setting of line width in vertical coffins in LaTeX

## [2020-12-03]

### Added

- `\peek_analysis_map_inline:n`
- `\peek_regex:nTF`, `\peek_regex_remove_once:nTF`, and
  `\peek_regex_replace_once:nnTF`
- `\token_case_catcode:NnTF`, `\token_case_charcode:NnTF`, and
  `\token_case_meaning:NnTF`

### Changed

- Extend `\text_expand:n` to cover `\@protected@testopt`
- Extend `\text_purify:n` to cover `\@protected@testopt`

## [2020-10-27]

### Added

- `\token_if_font_selection:N(TF)` (see \#806)

### Fixed

- Avoid relying on braced `\input` primitive syntax
- Correct expansion of environments in `\text_purify:n`
- Some aspects of `cctab` setup with 8-bit engines(issue [\#814](https://github.com/latex3/latex3/issues/814))

### Changed

- Improved performance for `tl` functions
- Extend case changer to cover all of Greek with pdfTeX

## [2020-10-05]

### Fixed

- Correctly detect LaTeX when pre-loading expl3 and setting up
  case changer
- Lua emulation of \strcmp (issue [\#813](https://github.com/latex3/latex3/issues/813))

## [2020-09-24]

### Changed

- Use Lua pseudo-primitives instead of `\directlua`
- `\token_if_primitive:N(TF)` now reports pseudo-primitives as primitives in LuaTeX

## [2020-09-06]

### Fixed

- Loading in generic mode (issue [\#800](https://github.com/latex3/latex3/issues/800))

## [2020-09-03]

### Fixed

- Save primitive definition of `\pdfoutput` with CSLaTeX

## [2020-09-01]

### Added

- `\hbox_overlap_center:n`

### Changed

- Backend setting for direct PDF output
- Backend setting for XeTeX support

### Deprecated

- Backend setting `pdfmode`

### Fixed

- `\file_compare_timestamp:nNn(TF)` in LuaTeX (issue [\#792](https://github.com/latex3/latex3/issues/792))
- Text case changing and expansion where an excluded command is equivalent
  to `\use:n`

## [2020-08-07]

### Changed

- Color selection implementation
- Performance enhancements for `\keys_set:nn`

### Fixed

- Loading generically on ConTeXt (issue [\#783](https://github.com/latex3/latex3/issues/783))

## [2020-07-17]

### Added

- `l3cctab` module for using category code tables
- `\file_parse_full_name:n` and `\file_parse_full_name_apply:nN`
- Additional `\prop_put:Nnn` variants
- `\seq_set_map_x:NNn`
- `\msg_term:nn(nnnn)`

### Fixed

- File lookup with `\input@path`
- 8-bit encodings in `\str_set_convert:Nnnn`

### Changed

- Implementation of `\file_parse_full_name:nNNN` now uses
  `\file_parse_full_name:n` internally
- `\seq_set_map:NNn` no longer `x`-expands `<inline function>`
  (`\seq_set_map_x:NNn` now does that).  Both moved to stable.

### Removed

- Functions deprecated at end of 2019

### Deprecated

- `\str_declare_eight_bit_encoding:nnn`

## [2020-06-18]

### Changed

- Use `scn` operator for separations
- Internal color model
- Internal performance enhancements
- Moved `\msg_expandable_error:nn(nnnn)` to stable.
- Moved `\seq_indexed_map_inline:Nn` and `\seq_indexed_map_function:Nn`
  to stable as `\seq_map_indexed_inline:Nn` and `\seq_map_indexed_function:Nn`.
- Internal changes to `expl3` to allow loading earlier in LaTeX2e.

## [2020-06-03]

### Added

- `\str_convert_pdfname:n`

## [2020-05-15]

### Changed

- Make `\text_purify:n` `f`-type expandable

## [2020-05-14]

### Changed

- Performance improvements in keyval processing

## [2020-05-11]

### Changed

- Internal changes to quark handling

## [2020-05-05]

### Added

- Recognize the exponent marker `E` (same as `e`) in floating point numbers

### Fixed

- Leave active characters untouched when case-changing (see \#715)

## [2020-04-06]

### Added

- Control for start-of-titlecasing: see `\l_text_titlecase_check_letter_bool`

### Fixed

- Nesting of `\seq_shuffle:N` in another sequence mapping (issue [\#687](https://github.com/latex3/latex3/issues/687))
- `\ior_shell_open:Nn` in engines other than LuaTeX - shell commands didn't
  execute, plus the command call would be left in the input stream.

## [2020-03-06]

### Added

- `\text_purify:n`

### Fixed

- Issue with case-changing Turkish

## [2020-03-03]

### Added

- `\tex...:D` coverage for TeX Live 2020 engine changes

### Changed

- New implementation for `\keyval_parse:NNn` - around 40% speed improvement,
  also _expandable_

### Fixed

- Make `expl3` reload-safe for `latexrelease` (see latex3/latex2e\#295)

## [2020-02-25]

### Changed

- Extend case-changing encoding support to Cyrillic and Greek

## [2020-02-21]

### Added

- Option `suppress-backend-headers` (see matching change in
  `l3backend`)

### Changed

- Allow `dvisvgm` driver with XeTeX (issue [\#677](https://github.com/latex3/latex3/issues/677))

### Fixed

- `undo-recent-deprecations` would not reload the deprecation code

## [2020-02-14]

### Fixed

- Interaction with some `babel` languages at the start of the document

## [2020-02-13]

### Changed

- Leave implicit tokens unchanged by `\text_expand:n`
- Extend the `de-alt` case changing locale to 8-bit engines

## [2020-02-11]

### Added

- Key property `.cs_set:Np` and variants

### Changed

- Support `\@uclclist` entries when case-changing

### Fixed

- Allow for full range of encodings when expanding text (issue [\#671](https://github.com/latex3/latex3/issues/671))
- Support `\begin`/`\end` in text expansion

## [2020-02-08]

### Added

- `\l_keys_key_str` and `\l_keys_path_str`

### Deprecated

- `\l_keys_key_tl` and `\l_keys_path_tl`, replaced by `\l_keys_key_str` and
  `\l_keys_path_str`, respectively

## [2020-02-03]

### Changed

- Minor edits to LaTeX3 News

## [2020-01-31]

### Added

- Table of Contents for combined LaTeX3 News

### Changed

- Use Lua `utf8` library if available

### Fixed

- Undefined command in box debugging code

## [2020-01-22]

### Added

- Support for command replacement in text expansion

### Changed

- Require key values for numerical key types (dim, int, etc.) (see \#661)

### Fixed

- Issue with keys where some leading spaces could be left in key names

## [2020-01-12]

### Added

- `\bool_case_true:n(TF)` and `\bool_case_false:n(TF)`
- `\file_hex_dump:n(nn)` and `\file_get_hex_dump:n(nn)N(TF)`
- `\str_<type>case:n`
- `\text_<type>case:n(n)`
- `\text_expand:n` and supporting data structures

### Changed

- Distribute LaTeX3 News
- Moved `\char_<type>case:N` to stable
- Documentation improvements

### Fixed

- Inherit key required/forbidden properties (see \#653)
- Set backend at the beginning of `\document` (see \#657)

### Deprecated

- `\str_<type>_case:n` replaced by `\str_<type>case:n`
  except `\str_mixed_case:n` replaced by `\str_titlecase:n`
- `\tl_<type>_case:n(n)` replaced by `\text_<type>case:n(n)`,
  except `\tl_mixed_case:n(n)` replaced by `\text_titlecase:n(n)`

## [2019-11-07]

### Fixed

- Handling of repeated loading of a backend (issue [\#646](https://github.com/latex3/latex3/issues/646))
- Handling of repeated loading of deprecated functions

## [2019-10-28]

### Fixed

- File searching when `\(pdf)filesize` is not available (issue \#644)

## [2019-10-27]

### Changed

- Internal structure of `\c_sys_jobname_str` altered
- Update upTeX test to follow guidance from developers

## [2019-10-24]

### Changed

- File names are now returned without quotes by `\file_full_name:n`

### Fixed

- `\file_if_exist:n(TF)`, etc., when dealing with file names containing
  spaces (see \#642)

## [2019-10-21]

### Added

- Lua function `l3kernel.shellescape()`

### Changed

- Better coverage of (u)pTeX primitives following publication of
  pTeX manual in English
- Trim spaces surrounding file names

### Removed

- HarfTeX primitives

## [2019-10-14]

### Fixed

- Correct handling of 'traditional' class options for backend

## [2019-10-11]

### Changed

- Standard backend for (u)pTeX is now `dvips`
- Minimum LuaTeX version now v0.95
- Moved `\debug_on:n`, `\debug_off:n`, `\debug_suspend:` and `\debug_resume:`
  to stable
- Accept 'traditional' class options for backend (`dvipdfmx`, `dvips`, etc.)
- Performance enhancements when loading `expl3`

### Fixed

- Handling of files with no extension
- Behavior of Lua function `l3kernel.charcat` in some circumstances
- Loading under ConTeXt

## [2019-10-02]

### Fixed

- Variants using `\exp_args` functions with more than 9 arguments (see \#636)

## [2019-09-30]

### Fixed

- File searching using `\file_full_name:n` (see \#634)

## [2019-09-28]

### Changed

- Speed up variants and reduce their `\tracingall` output
- Debug and deprecation code are now loaded independently of expl3 core
- `\file_compare_timestamp:nNn(TF)` now usable in expansion contexts
- Moved to stable:
  - `\bool_const:Nn`
  - `\dim_sign:n`
  - `\file_compare_timestamp:nNn(TF)`
  - FP `logb` operator
  - `\fp_sign:n`
  - `fparray` module
  - `\int_sign:n`
  - `\intarray_const_from_clist:Nn`
  - `\intarray_show:N`
  - `\ior_map_variable:NNn`
  - `\ior_str_map_variable:NNn`
  - `\mode_leave_vertical:`
  - `\prop_(g)set_from_clist:Nn`
  - `\prop_const_from_clist:Nn`
  - `\seq_const_from_clist:Nn`
  - `\seq_(g)shuffle:N`
  - `\sys_if_platform_unix:(TF)`
  - `\sys_if_platform_windows:(TF)`
  - `\sys_gset_rand_seed:`
  - `\sys_rand_seed:`
  - Shell access functions

### Fixed

- Key `.initial:n` property when combined with inherited keys (see \#631)

## [2019-09-19]

### Fixed

- Loading Unicode data when some chars may be active (see \#627)

## [2019-09-08]

### Fixed

- Missing internal variant (issue \#624)

## [2019-09-05]

### Added

- `\file_full_name:n`, `\file_mdfive_hash:n`, `\file_size:n`,
  `\file_timestamp:n`
- `\seq_map_tokens:Nn`, `\tl_map_tokens:nn`, `\tl_map_tokens:Nn`

### Changed

- Moved `\prop_map_tokens:Nn` to stable
- Generate chars with catcode as-supplied when case changing

## [2019-08-25]

### Added

- `\fp_if_nan:nTF`

### Changed

- Make round(.,nan)=nan with no "Invalid operation" error

### Fixed

- `\tl_rescan:nn` and `\tl_(g)set_rescan:Nnn` when single-line input
  contains a comment character (see \#607)
- Final value of the variable in `\tl_map_variable:NNn` and
  `\clist_map_variable:NNn`.
- Remove duplicate keys in `\prop_set_from_keyval:Nn` (see \#572)

## [2019-08-14]

### Deprecated

- `\c_term_ior`

### Fixed

- Coffin pole intersection in some cases (see \#605)

## [2019-07-25]

### Fixed

- Loading for `expl3` with plain TeX

## [2019-07-01]

### Added

- Moved `l3str-convert` module to `l3kernel`

### Changed

- Ensure `\msg_fatal:nn` ends the TeX run if used inside an
  hbox (see \#587)
- Moved backend code to a separate release schedule

### Fixed

- Handling of control sequences in key names (see \#594)

## [2019-05-28]

### Added

- Experimental `\file_compare_timestamp:nNn(TF)`

### Changed

- Precedence of juxtaposition (implicit multiplication) in `l3fp`
  now different for keywords/variables and factors in parentheses

## [2019-05-09]

### Added

- Experimental driver-level interfaces for image inclusion
- Experimental `\ior_shell_open:Nn`

### Fixed

- Some issues in `dvisvgm` driver

## [2019-05-07]

### Added

- `.muskip_set:N` property

### Changed

- Experimental `\driver_pdf_compress_objects:n` replaces
  `\driver_pdf_objects_(en|dis)able:`

## [2019-05-05]

### Added

- `\char_str_<target>_case:N`

### Fixed

- Infinite loop in some cases in DVI mode due to link-breaking code
  (see \#570)
- Category code of output from `\char_<target>_case:N`, and
  same issue in `\str_<target>_case:n`

## [2019-05-03]

### Added

- New `l3legacy` module containing
  - `\legacy_if:n(TF)`

### Changed

- Moved `\file_get_mdfive_hash:nN(TF)`, `\file_get_size:nN(TF)`
   and `\file_get_timestamp:nN(TF)` to stable
- Moved `\file_if_exist_input:n` and `\file_if_exist_input:nF` to stable
- Moved `\file_input_stop:` to stable
- Moved `\peek_N_type:TF` to stable

## [2019-04-21]

### Added

- Experimental support for a range of PDF concepts at the lowest
  (driver abstraction) level

## [2019-04-06]

### Changed

- Moved `\tl_if_single_token:n(TF)` to stable

### Fixed

- Support for ConTeXt from mid-December 2018

## [2019-03-26]

### Fixed

- Loading when pre-TL'18 XeTeX is in use (see \#555)

## [2019-03-05]

### Added

- `\str_log:n`, `\str_log:N`
- `TF` versions for `\file_get_...:nN` and `\ior_(str_)get:NN` functions
- `\cs_prefix_spec:N`, `\cs_argument_spec:N`, `\cs_replacement_spec:N`
- `undo-recent-deprecations` option
- `factorial` function in `l3fp`

### Changed

- Return values from `\file_get:nnN`, `\file_get_...:nN`, `\ior_get:NN`,
  `\sys_shell_get:nnN`
- Moved coffin affine transformations to stable
- Moved `\prop_count:N` to stable
- Moved `\tl_count_tokens:n` to stable
- Completed emulation of e-type argument when `\expanded` is unavailable
- Made expandable messages expand their result, like usual messages
- Made deprecation errors less intrusive by default
- Stopped providing do-nothing `\color` macro when undefined

### Deprecated

- `\token_get_prefix_spec:N`, `\token_get_arg_spec:N`,
  `\token_get_replacement_spec:N` replaced by `\cs_prefix_spec:N`,
  `\cs_argument_spec:N`, `\cs_replacement_spec:N`, respectively

### Fixed

- Treatment of inherited keys when setting only known keys (see \#548)

### Removed

- Experimental `\skip_split_finite_else_action:nnNN`
- Experimental `\tl_reverse_tokens:n`

## [2019-02-15]

### Changed

- Defensive code for redefinition of `\time`, `\day`, `\month` and `\year`

### Fixed

- Resetting of key inheritance (see \#535)
- Issue in deprecated command `\tl_set_from_file:Nnn`
  (see <https://tex.stackexchange.com/q/474813/>)

## [2019-02-03]

### Added

- Support for return of whole path by `\keys_set_known:nnN`-like
  function `\keys_set_known:nnnN` (see \#508)
- `.prop_(g)put:N` key property (see \#444)

### Fixed

- Handling of nested key setting when filtering, _etc._ (see \#526)
- Inheritance of default values (see \#504)

## [2019-01-28]

### Added

- Global versions of box affine functions, e.g. `\box_grotate:Nn`
- Global versions of box size adjustment functions
- `\box_(g)set_eq_drop:NN`, `\(h|v)box_unpack_drop:N`
- `\file_get:nnN` and `\file_get:nnNTF`
- Experimental functions `\sys_shell_get:nnN` and `\sys_shell_get:nnNTF`

### Changed

- `\char_generate:nn` now always takes exactly two expansions
- Move `\prg_generate_conditional_variant:Nnn` to stable
- Renamed experimental `\box_trim:Nnnnn` and `\box_viewport:Nnnnn` as
  `\box_set_trim:Nnnnn` and `\box_set_viewport:Nnnnn`, respectively

### Deprecated

- `\box_(g)set_eq_clear:NN`, replaced by `\box_(g)set_eq_drop:NN`
- `\(h|v)box_unpack_clear:N`, replaced by `\(h|v)box_unpack_drop:N`
- `\tl_(g)set_from_file(_x):Nnn`, replaced by `\file_get:nnN`

### Fixed

- Scope treatment of `\box_set_dp:N`, _etc._
- In (u)platex: detection of spaces in `\tl_rescan:nn` and related functions

### Removed

- Experimental function family `\tl_(g)set_from_shell:(N|c)nn`
  (replaced by `\sys_shell_get:nnN`)

## [2019-01-13]

### Added

- `\ior_map_variable:NNn` and `\ior_str_map_variable:NNn`

### Fixed

- Unclosed conditional with Unicode engines

## [2019-01-12]

### Changed

- Improved `expl3` loading time with LuaTeX and XeTeX
- Improved performance of `\ior_map_inline:Nn` and related functions

### Fixed

- Handling of accented characters under mixed case changing in 8-bit engines
  (see \#514)

## [2019-01-01]

### Added

- `\iow_allow_break:`

### Fixed

- Correct fp randint with zero argument (see \#507)
- Handling of `\current@color` with `(x)dvipdfmx` (see \#510)

### Removed

- Support for stand-alone `l3regex`, `l3sort`, `l3srt`, `l3tl-analysis`,
  `l3tl-build`
- `\box_resize:Nnn`
- `\box_use_clear:N`
- `\c_minus_one`
- `\file_add_path:nN`
- `\file_list:`
- `\file_path_include:n` and `\file_path_remove:n`
- `\io(r|w)_list_streams:` and `\io(r|w)_log_streams:`
- `\sort_ordered:` and `\sort_reversed:`
- `\token_new:Nn`
- Generation of invalid variants from `n`/`N` base types

## [2018-12-12]

### Changed

- Move `\tl_range:nnn` to stable

### Fixed

- Loading in ConTeXt MkIV

## [2018-12-11]

### Changed

- Enable `\char_generate:nn` to create active tokens with XeTeX

## [2018-12-06]

### Changed

- Apply `\par` only at the end of vertical boxes
- Move `\int_rand:n` to stable
- Move `\<var>_rand_item:N` to stable

### Fixed

- Typo in `\lua_shipout_e:n` (see \#503)

## [2018-11-19]

### Added

- Support for cross-compatibility primitives in XeTeX
- `\int_sign:n`, `\dim_sign:n` and `\fp_sign:n`

## [2018-10-19]

### Fixed

- Wrapping of text in messages, etc., for some line lengths (issue \#491)

## [2018-10-17]

### Added

- `\g_msg_module_documentation_prop` (see \#471)
- `\peek_remove_spaces:n`

### Changed

- Formatting of messages: now follows LaTeX2e closely

### Deprecated

- `\msg_interrupt:nn`, `\msg_log:n` and `\msg_term:n`

### Fixed

- Handling of inheritance for choice keys (issue \#483)

## [2018-09-24]

### Added

- Some driver-level support for PDF features
- `\peek_catcode_collect_inline:Nn`, `\peek_charcode_collect_inline:Nn`,
  `\peek_meaning_collect_inline:Nn`

### Fixed

- Handling of unknown keys when inheritance is active (issue \#481)

## [2018-08-23]

### Added

- `\lua_escape:e`, `\lua_now:e` and `\lua_shipout_e:n`
- `\str_case_e:nn(TF)` and `\str_if_eq:ee(TF)`
- `\sys_if_platform_unix:(TF)` and `\sys_if_platform_windows:(TF)`
- `\tl_(g)set_from_shell:Nnn`

### Deprecated

- `\lua_escape_x:n`, `\lua_now_x:n` and `\lua_shipout_x:n`
- `\str_case_x:nn(TF)` and `\str_if_eq_x:nn(TF)`

## [2018-06-14]

### Added

- Support for `e`-type argument using `\expanded` or macro emulation

## [2018-06-01]

### Added

- `CHANGELOG.md` (issue \#460)

### Fixed

- Loading `expl3` with LuaTeX/XeTeX and certain letter tokens set
  to be active (see \#462)

### Changed

- Alter `\char_codepoint_from_bytes:n` to produce four groups in all
  cases; make `f`-type expandable

## [2018-05-13]

### Fixed

- Correct date string in `expl3.dtx`
- Correct `\c_sys_engine_version_str` when using XeTeX

## [2018-05-12]

### Added

- Define `\c_zero_int` and `\c_one_int`
- Implement `\c_sys_engine_version_str`
- Implement `\seq_indexed_map_function/inline`
- Implement `\intarray_gzero:N`
- Implement `\intarray_const_from_clist:Nn`
- Implement `\bool_set_inverse:N`
- Implement `\bool_xor:nnTF` instead of just `\bool_xor_p:nn`
- Implement candidate `\int_rand:n`
- Implement `\intarray_gset_rand:Nnn`
- Implement candidate `l3fparray` module

### Changed

- Update minimal required versions of XeTeX and LuaTeX
- Deprecate named integer constants `\c_zero`. etc.
- Move all primitives to `\tex_...:D namespace`,
  deprecating older engine-dependent prefixes
- Several internal optimizations

### Fixed

- Expand boolean expression before calling `\chardef` (issue \#461)

### Removed

- Remove undocumented `\fp_function:Nw` and `\fp_new_function:Npn`

## [2018-04-30]

### Added

- Implement `\tl_analysis_map_inline:nn`
- Implement `\exp_args_generate:n` to define new `\exp_args:N...`
  functions
- Low-level `\int_value:w` function
- New experimental functions for
  - Building token lists piecewise
  - Fast manipulation of integer arrays
  - Sequence shuffling
  - `\seq_set_from_function:NnN`
  - `\char_codepoint_to_bytes:n`

### Changed

- Significant internal revision to use only internal functions
  'private' to specific modules
- Better documentation of cross-module kernel-internal functions
- Enable `\char_generate:nn` for active chars
- Renamed `\tl_show_analysis:(N|n)n` as `\tl_analysis_show:(N|n)n`
- Change `\int_rand:nn` (and rand_item functions) to better use
  the RNG
- Make prg break functions public
- Make scan marks mechanism public
- Make `\prg_do_nothing:` long rather than nopar (issue \#455)
- Several performance improvements
- Documentation improvements

### Fixed

- Only index TF, T, F functions together if they are `expl3`
  functions (issue \#453)
- Make `\infty` and `\pi` into errors in fp expressions
  (issue \#357)

### Removed

- Deprecated functions expiring at end of 2017
- Old module `.sty` files

## [2018-03-05]

### Changes

- Adjustments to `l3drivers` to support `l3draw` development in
  `l3experimental` bundle

## [2018-02-21]

### Added

- Tuple support in fp expressions
- Step functions have been added for dim variables,
  e.g. `\dim_step_inline:nnnn`

[Unreleased]: https://github.com/latex3/latex3/compare/2026-08-10...HEAD
[2026-08-10]: https://github.com/latex3/latex3/compare/2026-08-02...2026-08-10
[2026-08-02]: https://github.com/latex3/latex3/compare/2026-07-20...2026-08-02
[2026-07-20]: https://github.com/latex3/latex3/compare/2026-06-19...2026-07-20
[2026-06-19]: https://github.com/latex3/latex3/compare/2026-06-18...2026-06-19
[2026-06-18]: https://github.com/latex3/latex3/compare/2026-05-26...2026-06-18
[2026-05-26]: https://github.com/latex3/latex3/compare/2026-05-15...2026-05-26
[2026-05-15]: https://github.com/latex3/latex3/compare/2026-04-28...2026-05-15
[2026-04-28]: https://github.com/latex3/latex3/compare/2026-03-20...2026-04-28
[2026-03-20]: https://github.com/latex3/latex3/compare/2026-03-16...2026-03-20
[2026-03-16]: https://github.com/latex3/latex3/compare/2026-02-18...2026-03-16
[2026-02-18]: https://github.com/latex3/latex3/compare/2026-01-19...2026-02-18
[2026-01-19]: https://github.com/latex3/latex3/compare/2026-01-10...2026-01-19
[2026-01-10]: https://github.com/latex3/latex3/compare/2025-12-29...2026-01-10
[2025-12-29]: https://github.com/latex3/latex3/compare/2025-12-24...2025-12-29
[2025-12-24]: https://github.com/latex3/latex3/compare/2025-11-14...2025-12-24
[2025-11-14]: https://github.com/latex3/latex3/compare/2025-11-06...2025-11-14
[2025-11-06]: https://github.com/latex3/latex3/compare/2025-10-24...2025-11-06
[2025-10-24]: https://github.com/latex3/latex3/compare/2025-10-09...2025-10-24
[2025-10-09]: https://github.com/latex3/latex3/compare/2025-09-02...2025-10-09
[2025-09-02]: https://github.com/latex3/latex3/compare/2025-08-13...2025-09-02
[2025-08-13]: https://github.com/latex3/latex3/compare/2025-07-20...2025-08-13
[2025-07-20]: https://github.com/latex3/latex3/compare/2025-07-19...2025-07-20
[2025-07-19]: https://github.com/latex3/latex3/compare/2025-07-11...2025-07-19
[2025-07-11]: https://github.com/latex3/latex3/compare/2025-06-30...2025-07-11
[2025-06-30]: https://github.com/latex3/latex3/compare/2025-06-09...2025-06-30
[2025-06-09]: https://github.com/latex3/latex3/compare/2025-05-26...2025-06-09
[2025-05-26]: https://github.com/latex3/latex3/compare/2025-05-19...2025-05-26
[2025-05-19]: https://github.com/latex3/latex3/compare/2025-04-29...2025-05-19
[2025-04-29]: https://github.com/latex3/latex3/compare/2025-04-14...2025-04-29
[2025-04-14]: https://github.com/latex3/latex3/compare/2025-03-26...2025-04-14
[2025-03-26]: https://github.com/latex3/latex3/compare/2025-03-10...2025-03-26
[2025-03-10]: https://github.com/latex3/latex3/compare/2025-01-18...2025-03-10
[2025-01-18]: https://github.com/latex3/latex3/compare/2025-01-14...2025-01-18
[2025-01-14]: https://github.com/latex3/latex3/compare/2024-12-25...2025-01-14
[2024-12-25]: https://github.com/latex3/latex3/compare/2024-12-09...2024-12-25
[2024-12-09]: https://github.com/latex3/latex3/compare/2024-11-02...2024-12-09
[2024-11-02]: https://github.com/latex3/latex3/compare/2024-10-09...2024-11-02
[2024-10-09]: https://github.com/latex3/latex3/compare/2024-09-10...2024-10-09
[2024-09-10]: https://github.com/latex3/latex3/compare/2024-08-30...2024-09-10
[2024-08-30]: https://github.com/latex3/latex3/compare/2024-08-16...2024-08-30
[2024-08-16]: https://github.com/latex3/latex3/compare/2024-07-20...2024-08-16
[2024-07-20]: https://github.com/latex3/latex3/compare/2024-06-19...2024-07-20
[2024-06-19]: https://github.com/latex3/latex3/compare/2024-05-27...2024-06-19
[2024-05-27]: https://github.com/latex3/latex3/compare/2024-05-08...2024-05-27
[2024-05-08]: https://github.com/latex3/latex3/compare/2024-04-11...2024-05-08
[2024-04-11]: https://github.com/latex3/latex3/compare/2024-03-14...2024-04-11
[2024-03-14]: https://github.com/latex3/latex3/compare/2024-02-20...2024-03-14
[2024-02-20]: https://github.com/latex3/latex3/compare/2024-02-18...2024-02-20
[2024-02-18]: https://github.com/latex3/latex3/compare/2024-02-13...2024-02-18
[2024-02-13]: https://github.com/latex3/latex3/compare/2024-01-22...2024-02-13
[2024-01-22]: https://github.com/latex3/latex3/compare/2024-01-04...2024-01-22
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