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@@ -0,0 +1,1192 @@
+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a
+Changelog](https://keepachangelog.com/en/1.0.0/), and this project adheres to
+[Semantic Versioning](http://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Changed
+- Updates to follow LaTeX2e kernel revisions
+- No longer apply `\addtocontents` patch
+
+## [v2.8b] - 2020-02-25
+
+### Fixed
+- Correct `\ohm` when `newtxmath` is loaded
+
+## [v2.8a] - 2020-02-23
+
+### Fixed
+- Correct `\ohm` when `unicode-math` is loaded (issue #377)
+
+## [v2.8] - 2020-02-20
+
+### Changed
+- Use companion font symbols/force `textcomp` loading
+
+## [v2.7v] - 2020-02-19 [UNUSED]
+
+### Fixed
+- Appearance of superscript decimals with comma decimal marker
+
+## [v2.7u] - 2020-01-15
+
+### Changed
+- Modified internals to track `expl3` changes
+
+## [v2.7t] - 2019-10-10
+
+### Fixed
+- Combination of `round-half = even` with `round-precision = 0`
+- Include sign in astronomy-style angles
+
+## [v2.7s] - 2018-05-17
+
+### Changed
+- Revert package date format change in v2.7l
+
+## [v2.7r] - 2018-05-16
+
+### Changed
+- Modified internals to track `expl3` changes
+
+### Fixed
+- Collect tokens before `\ignorespaces` in tabulars (esp. with
+  REVTeX) (issue #337)
+
+## [v2.7q] - 2018-05-11
+
+### Fixed
+- Allow for `cellspace` "column" option (issue #315)
+
+## [v2.7p] - 2018-05-10
+
+### Changed
+- Avoid an `expl3` internal function
+- Better approach to removing `\ignorespaces`
+
+## [v2.7o] - 2018-05-02 [UNUSED]
+
+## [v2.7n] - 2018-04-27
+
+### Fixed
+- Issue with symbolic input and digit grouping
+
+## [v2.7m] - 2018-03-20
+
+### Changed
+- Update `\astronomicalunit` symbol (issue #332)
+
+## [v2.7l] - 2018-03-11
+
+### Added
+- Abbreviations for milli/microjoule
+
+### Changed
+- Switch package date format to ISO
+
+### Fixed
+- Scope of some internal variable corrected (issue #327)
+- Track `unicode-math` changes (issue #331)
+
+## [v2.7k] - 2017-11-26
+
+### Fixed
+- Incorrect internal variable renamed (issue #320)
+- Suppress leading "1" when units are not parsed (issue #318)
+- Correct default value for `arc-separator` (issue #319)
+
+## [v2.7j] - 2017-08-02
+
+### Fixed
+- Use correct name for internal boolean
+
+## [v2.7i] - 2017-07-23
+
+### Fixed
+- Incorrect internal variable renamed (issue #311)
+
+## [v2.7h] - 2017-06-13
+
+### Changed
+- Some abuses of `expl3` box functions removed (issue #309)
+
+## [v2.7g] - 2017-05-19
+
+### Changed
+- Use new `expl3` functions for some internal tests
+
+### Fixed
+- Change box collection following `expl3` update
+- Links to BIPM website
+
+## [v2.7f] - 2017-03-23
+
+### Changed
+- Name of 'hidden' function used by for bookmark generation
+
+### Fixed
+- Spacing when option `per-mode = reciprocal-positive-first` is active
+
+## [v2.7e] - 2017-03-06
+
+### Fixed
+- Properly handle signs in `table-format` key (issue #303)
+
+## [v2.7d] - 2017-02-19
+
+### Fixed
+- Avoid doubled tokens in pre-number part of tables
+
+## [v2.7c] - 2017-02-01
+
+### Fixed
+- Correct integer alignment in tables (issue #302)
+
+## [v2.7b] - 2017-01-28
+
+### Fixed
+- Fix an issue with large numbers in scientific mode (issue #301)
+
+## [v2.7a] - 2017-01-01
+
+### Changed
+- Track `expl3` changes regarding key-value management
+
+## [v2.7] - 2017-01-01
+
+### Added
+- Code-level API variable `\l_siunitx_unit_symbolic_seq`
+
+### Fixed
+- Allow for `cellspace` package in math mode
+
+## [v2.6s] - 2016-09-02
+
+### Changed
+
+- Improved a warning concerning `color` package
+
+## [v2.6r] - 2016-08-22
+
+### Changed
+- Warn if `color` is not loaded (issue #289)
+- Document some aspects of internal number processing (issue #294)
+- Minor `expl3` fixes including tracking deprecations
+
+### Fixed
+- Handling of `e0` input (issue #292)
+- Added some missing internal variable declarations
+
+## [v2.6q] - 2016-03-01
+
+### Fixed
+- Correct detection of font inside cells
+
+### Changed
+- Index formatting
+
+## [v2.6p] - 2016-01-19
+
+### Fixed
+- Formatting of `\degreeCelsius` (issue #285)
+- Allow input unit with prefix and `\per` in `exponent-to-prefix` (issue 283)
+
+## [v2.6o] - 2016-01-05
+
+### Fixed
+- Allow for unit powers when converting exponents to prefixes
+
+## [v2.6n] - 2015-12-31
+
+### Changed
+- Formatting of `\degreeCelsius` (issue #282)
+
+### Fixed
+- Appearance of ångström with LuaTeX (issue #280)
+
+## [v2.6m] - 2015-10-15
+
+### Fixed
+- Interaction with `mwtab` in some table cells
+
+## [v2.6l] - 2015-09-14
+
+### Fixed
+- An internal error in literal unit formatting
+
+## [v2.6k] - 2015-09-12
+
+### Changed
+- Track/exploit `expl3` updates
+
+## [v2.6j] - 2015-09-01
+
+### Fixed
+- Treatment of `\pm` when `exponent-to-prefix` is true
+- Print all units when `exponent-to-prefix` is true
+
+## [v2.6i] - 2015-08-18
+
+### Changed
+- Performance improvements
+- Removed one deprecated `expl3` functions
+
+### Fixed
+- Use of `\cancel` in math mode (issue #264)
+- Cope better with large numbers when rounding (issue #198)
+
+## [v2.6h] - 2015-07-17
+
+### Changed
+- Track `expl3` changes
+
+## [v2.6g] - 2015-06-25
+
+### Fixed
+-  Handling of empty table cells (issue #271)
+
+## [v2.6f] - 2015-06-16
+
+### Added
+- Spanish coverage for translations
+
+### Changed
+- Approach to supporting `mathspec`
+- Remove a (probably) misplaced `\scan_stop:`
+
+### Fixed
+- Behaviour of `table-sign-exponent` and `table-sign-mantissa` when set
+  false
+
+## [v2.6e] - 2015-01-21
+
+### Changed
+- Auto-detect `mathspec`/`eulervm`
+
+## [v2.6d] - 2014-10-28
+
+### Fixed
+- Fix conversation of uncertainty part with integer mantissas
+
+## [v2.6c] - 2014-10-01
+
+### Fixed
+- `\micro` when `fontspec` is loaded
+
+## [v2.6b] - 2014-09-27
+
+### Changed
+-  Method for font shape detection to allow for, _e.g._ `\scshape`
+
+### Fixed
+- Typo in standard `input-protect-tokens` options
+
+## [v2.6a] - 2014-09-15
+
+### Changed
+- Improved Unicode math symbol coverage
+
+## [v2.6] - 2014-09-05
+
+### Changes
+- Switch to math mode by default for all printing
+- Use `\mathord` before comparators
+- Only apply 'tight' spacing to `\mathbin` cases
+- Use a 'real' minus with `tex4ht`
+- Use a full width space between number and unit (issue #230)
+- Note that colour for printing powers is set by `power-font` (issue #240)
+- Use `\mathord` to get 'tight' spacing for signs (issue #241)
+- Old `repeatunits` option is partly coved by `range-units` (issue #254)
+
+### Fixed
+- Loading when `mdwtab` is in use
+- Appearance of minus sign when `tex4ht` is in use
+- Spacing when printing comparators
+- Preserve `\fg` in bookmarks (issue #226)
+- Allow for `output-exponent-marker` option in tables (issue #232)
+- Conversion of integer with separate uncertainty to 'compact' form
+  (issue #233)
+- Option name wrong in v1 table (issue #240)
+- Use `\textpm` in text mode if `textcomp` package is loaded (issue #249)
+- Ignore hard spaces in `\num` (issue #256)
+- Use `\mathord for tight spacing on 'in line' exponent (issue #257)
+
+## [v2.5s] - 2013-07-31
+
+### Fixed
+- Internal issue with one key
+
+## [v2.5r] - 2013-07-11
+
+## Fixed
+- Update internals to remove deprecated key support
+
+## [v2.5q] - 2013-03-11
+
+### Changed
+- Issue warning if `cellspace` column letter is moved
+
+### Fixed
+- Reorder creation of unit wrappers and option setting (issue #218)
+- Replace active hyphen with 'other' one (issue #222)
+
+## [v2.5p] - 2013-02-01
+
+### Fixed
+- Search/replace `\pm` and `\mp` in text mode printing
+
+## [v2.5o] - 2013-01-09
+
+### Changed
+- Track `expl3` changes
+
+## [v2.5n] - 2012-12-29
+
+### Fixed
+- Correctly calculate grouping data to send to `pgf` (issue #211)
+
+## [v2.5m] - 2012-11-27
+
+### Fixed
+- Allow for `bidi`/RTL when applying `\text`
+- Search-and-replace in UTF-8 literal units
+- Load binary-units only when requested (issue #201)
+- Disable `\hightlight` in bookmarks (issue #207)
+
+## [v2.5l] - 2012-11-21
+
+### Changed
+- Track `expl3` changes
+
+## [v2.5k] - 2012-11-13
+
+### Changed
+- Explicitly require `xparse`
+
+### Fixed
+- Skip white space after `\begin{document}`
+- Correct use of fixed dimension/skip values internally
+- Store name of `\frac` function, don't `\let` it (issue #203)
+
+## [v2.5j] - 2012-09-18
+
+### Fixed
+- Erroneous branch in test for rounding removed (issue #202)
+
+## [v2.5i] - 2012-09-11
+
+### Changed
+- Internal search for first token in some strings
+
+### Fixed
+- Align numbers with no uncertainties correctly when space is reserved
+  for uncertainty part
+
+## [v2.5h] - 2012-08-28
+
+### Changed
+- Test literal units for being 'blank' not 'empty'
+
+## [v2.5g] - 2012-07-22
+
+### Fixed
+- Function of `binary-units` option
+
+## [v2.5f] - 2012-07-16
+
+### Changed
+- Track `expl3` changes
+
+## [v2.5e] - 2012-06-13
+
+### Fixed
+- An internal error in unit expansion (introduced in v2.4f)
+
+## [v2.5d] - 2012-06-11
+
+### Added
+- Extend qualifier system to cover 'phrases'
+
+### Changed
+- Extend UTF-8 support (issue #199)
+- Track `expl3` changes
+
+## [v2.5c] - 2012-05-03
+
+### Fixed
+- Detect and skip empty `s`-column cells (issue #197)
+- Detection of zero input with fixed exponent (issue #198)
+
+## [v2.5b] - 2012-04-21
+
+### Fixed
+- Detect eulervm package (issue #195)
+- Search-and-replace for category 'other' "_' and "^" in literal
+  units (issue #196)
+
+## [v2.5a] - 2012-04-19
+
+### Fixed
+- When creating free-standing unit, allow for dynamic nature of
+  spacing (bug introduced in v2.5)
+
+## [v2.5] - 2012-04-15
+
+### Added
+- Option `zero-decimal-to-integer` (issue #178)
+- Option to omit uncertainly entirely (issue #180)
+
+### Changed
+- Reduce use of implicit math mode
+- Document that `round-mode = places` acts on the mantissa (issue #193)
+- Rearrange processing code such that exponents can be dropped (issue #192)
+
+### Fixed
+- Use a standard-width comparator for tables (issue #183)
+
+## [v2.4n] - 2012-04-12
+
+### Changed
+- Extend scientific notation code to better handle large numbers of digits
+
+## [v2.4m] - 2012-04-04
+
+### Fixed
+- Handling of a single entry in `\SIlist`
+
+## [v2.4l] - 2012-03-23
+
+### Fixed
+- Load ordering with `soulpos`
+
+## [v2.4k] - 2012-03-22
+
+### Fixed
+- Interaction of `^` and `_` with `brenw (issue #191)
+- Adapted `list-pair-separator` for `translator` package (issue #190)
+- Check for `round-minimum` with large values
+
+## [v2.4j] - 2012-01-26
+
+### Fixed
+- Ensure that typesetting is in hmode
+
+## [v2.4i] - 2012-01-19
+
+### Fixed
+- Check for zero decimal part (issue #186)
+
+## [v2.4h] - 2012-01-15
+
+### Changed
+- Shortened an internal code path
+
+### Fixed
+- Bug in `reciprocal-positive-first` implementation
+
+## [v2.4g] - 2012-01-06
+
+### Changed
+- Internal changes due to update to `expl3` (issue #131)
+
+## [v2.4f] - 2011-12-24
+
+### Changed
+- Improve performance in an internal mapping
+- Use faster data structures internally
+
+### Fixed
+- Force font update in table cells
+- One incorrect internal variable name
+
+## [v2.4e] - 2011-12-11
+
+### Fixed
+- Replacements used with `latin1` encoding
+
+## [v2.4d] - 2011-12-09
+
+### Changed
+- Source formatting
+
+### Fixed
+- Free-standing units using `xspace` in captions
+
+## [v2.4c] - 2011-12-09
+
+### Fixed
+- Test for text mode font
+
+## [v2.4b] - 2011-12-09
+
+### Fixed
+- Incorrect doubling of `#` tokens
+
+## [v2.4a] - 2011-12-04
+
+### Changed
+- Extend search-and-replace in units to cover UTF-8 symbols
+- Symbols used with UTF-8 engines (issue #176)
+
+### Fixed
+- Interaction of `textcomp` with user symbol changes (issue #181)
+
+## [v2.4] -  2012-04-15
+
+### Added
+- Option `round-half = even` (issue #40)
+- Option `list-pair-separator` (issue #136)
+- Auto-conversion for prefixes (issue #173)
+- Notes for upgraders
+
+### Changed
+- Automatically 'compress' exponents (issue #62)
+- Clean up internal `expl3` usage
+- Removed remaining 'math' options
+
+### Fixed
+- Replace minus sign in text mode (issue #161)
+
+## [v2.3h] - 2011-10-14
+
+### Changed
+- Internal logic improved
+- Explicitly load `xfac` as part of documentation
+
+### Fixed
+- Select math mode with `tex4ht`  (issue #170)
+- Print superscripts using HTML tags with `tex4ht` (issue #171)
+
+## [v2.3g] - 2011-10-06
+
+### Changed
+- Mark-up in documentation
+
+### Fixed
+- Check for leading zero when dealing with rounding 'large' exponents
+  (issue #168)
+- Internal issue with undeclared variable
+
+## [v2.3f] - 2011-09-13
+
+### Fixed
+- Trap erroneous numbers in tables (issue #167)
+
+## [v2.3e] - 2011-09-09
+
+### Added
+- Advice on local installation
+
+### Changed
+- Remove deprecated `expl3` functions
+- Performance improvements
+
+## [v2.3d] - 2011-08-18
+
+### Fixed
+- Bad csname for superscripts in literal mode
+
+## [v2.3c] - 2011-08-12
+
+### Fixed
+- Use correct `\pm` for units in literal mode (issue #163)
+
+## [v2.3b] - 2011-08-08
+
+### Added
+- Additional abbreviated units (issue #162)
+
+### Fixed
+- Definition of abbreviations using option `free-standing-units`
+
+## [v2.3a] - 2011-07-17
+
+### Changed
+- Internal `expl3` updates
+
+### Fixed
+- Restore changes from v2.2l, missed in v2.3
+
+## [v2.3] - 2011-07-09
+
+### Added
+- Supported for powers in literal units (issue #152)
+- Unit abbreviation `\hl`/`\hL`
+- Demo for 'closing up' not after an integer (issue #151)
+
+### Changed
+- Load binary units as an option
+- Used an internal version of `\textsuperscript`
+- Internal `expl3` style
+- Revised `s`-column printing
+
+###  Deprecated
+- Option `load-configurations`
+
+### Fixed
+- Behavior of `table-auto-round` option
+- Missing deactivation in `strict` option
+- Grouping digits (issue #133)
+- Addition of explicit sign to mantissa (issue #139)
+- Various issues with tabular alignment
+
+## [v2.2l] - 2011-06-30
+
+### Fixed
+- Group pre-unit parsing (issue #158)
+
+## [v2.2k] - 2011-06-27
+
+### Fixed
+- Avoid `\peek_...` inside the print routine (issue #157)
+
+## [v2.2j] - 2011-06-26
+
+### Fixed
+- Avoid box for range phrase (issue #156)
+
+## [v2.2i] - 2011-06-15
+
+### Fixed
+- Detect font in table cells before boxing up (issue #153)
+
+## [v2.2h] - 2011-06-03
+
+### Fixed
+- Deal correctly with 'roll-over' in rounding integer part (issue #150)
+
+## [v2.2g] - 2011-06-02
+
+### Fixed
+- Set per-unit options for list/range units when a single unit is used
+  (issue #149)
+- Add test for `parse-numbers = false` to `\tablenum` code
+
+## [v2.2f] - 2011-05-25
+
+### Fixed
+- `table-column-width = 0pt` (issue #146)
+
+## [v2.2e] - 2011-05-23
+
+### Fixed
+- Remove 'mantissa' marker for numbers with no real part (issue #145)
+
+## [v2.2d] - 2011-04-28
+
+### Fixed
+- The `strict` option (issue #143)
+- Add `\dots` to protected symbols (issue #131)
+
+## [v2.2c] - 2011-04-20
+
+### Fixed
+- Bad expansion of toks (issue #141)
+
+## [v2.2b] - 2011-04-19
+
+### Fixed
+- Bad formatting of negative exponents when using 'E' output
+- Internally one argument if `color` is not loaded (issue #138)
+- Make `\of` expandable in literal contexts (issue #137)
+
+## [v2.2a] - 2011-04-16
+
+### Changed
+- Make full text for tables, etc., hyperlinks in docs
+- Re-arrange docs
+- Performance enhancements
+
+### Fixed
+- Auto-insertion of "1" when literal mode is on (issue #135)
+- Detect `\end` macro and print output correctly (issue #134)
+- Group digits for input containing symbolic entries (issue #131)
+- Specify a default for `group-digits` (issue #130)
+- Correctly expand macros with arguments in tables (issue #129)
+- Ensure that `*` in tabular preamble works correctly with `S`/`s` columns
+  (issue #128)
+
+## [v2.2] - 2011-04-13
+
+### Added
+- `\tablenum` command (issue ##117)
+- Parse separated uncertainties (issue #57)
+- Allow `\cancel` in units (issue #4)
+- Allow `\highlight` in units
+- Option `table-column-width` (issue #105)
+- Option `bracket-negative-numbers` (issue #5)
+- Option `table-align-comparators` (issue #86)
+- Option `minimum-integer-digits` (issue #112)
+- Option to print exponent marker literally (issue #113)
+- Support for engineering-style number output (issue #114)
+- Example of centring a right-aligned column (issue #85)
+- Various unit abbreviations
+
+### Changed
+- Renamed `...-separator` options to `...-product` where appropriate
+
+### Fixed
+- Allow `\DeclareSIUnit` to take optional argument (issue #121)
+- Latent issue with micro symbol when `fontspec` is loaded
+- Right-alignment in fixed-width columns
+- Print leading `1` when units start `\per` and `per-mode = symbol`
+  (issue #125)
+
+## [v2.1p] - 2011-04-04
+
+### Fixed
+- Two bugs in comparator code
+
+## [v2.1o] - 2011-04-03
+
+### Fixed
+- Detect arev package (issue #122)
+- Allow for negative fixed exponents (issue #123)
+
+## [v2.1n] - 2011-03-31
+
+### Fixed
+- Rounding to zero significant figures should always give a 0 (issue #119)
+- `round-integer-to-decimal` when `round-precision = 0`
+
+## [v2.1m] - 2011-03-20
+
+### Added
+- `\J` as an abbreviation for `\joule`
+
+### Changed
+- Various improvements to documentation
+- Avoid expanding units when written to log as 'invalid literals'
+
+### Fixed
+- Ensure that some output occurs in when `round-precision = 0` and
+  `round-mode = places` (issue #111)
+
+## [v2.1l] - 2011-02-10
+
+### Fixed
+- A couple of errant 'weight' => 'family' changes
+
+## [v2.1k] - 2011-02-09
+
+### Added
+- Option `detect-inine-family`
+
+### Changed
+- Use an internal integer for text minus
+
+## [v2.1j] - 2011-02-01
+
+### Fixed
+- Check for `\inputencodingname` macro rather than `inputenc` package
+  (issue #107)
+
+## [v2.1i] - 2011-01-27
+
+### Changed
+- New approach for `detect-display-math`
+
+### Fixed
+- New approach to `symbol-or-fraction` (issue #104)
+
+## [v2.1h] - 2011-01-18
+
+### Changed
+- Detect AMS display-like environments
+
+## [v2.1g] - 2010-12-21
+
+### Changed
+- Update test for `expl3` and `xparse`
+
+## [v2.1f] - 2010-11-24
+
+### Fixed
+- One-letter typo (issue #101)
+
+## [v2.1e] - 2010-11-22
+
+### Fixed
+- Issue with free-standing unit options (issue #99)
+- Text mode symbols with `fontspec` (issue #98)
+
+## [v2.1d] - 2010-11-14
+
+### Fixed
+- Apply options for units when in free-standing mode (issue #97)
+- Typo in v1 configuration file
+
+## [v2.1c] - 2010-11-14
+
+### Added
+- Choice `text` for `qualifier-mode` option (issue #95)
+
+### Changed
+- Discourage line break between number and unit even when it is permitted
+  (issue #92)
+- Ensure that lists can break across lines
+- Restrict range and list functions to text mode
+- Auto-detect math mode in tables (issue #94)
+
+## [v2.1b] - 2010-11-05
+
+### Changed
+- Improve hyphen to minus correction (issue #89)
+
+### Fixed
+- One wrong variable used (issue #90)
+
+## [v2.1a] - 2010-11-05
+
+### Changed
+- Internal `expl3` improvements
+
+### Fixed
+- Print list separators in text mode (issue #87)
+- Add in some missing `\ensuremath` statements (issue #88)
+
+## [v2.1] - 2010-10-31
+
+### Added
+- Option `copy-complex-root` (issue #63)
+- Option `table-align-exponent` and `table-align-uncertainty` (issue #60)
+- Option `power-font` (issue #69)
+- Option `scientific-notation` (issue #11)
+- Option `round-integer-to-decimal` (issue #55)
+- Option `input-comparators` (issue #16)
+- Option `round-minimum` (issue #17)
+
+### Changed
+- Internal `expl3` improvements
+
+### Fixed
+- Correct abbreviation for `\kelvin`
+- Bug in conversion code for 'large' numbers to scientific format
+- Bug with rounding check if decimal part is empty
+- Remove decimal marker if rounding gives an empty decimal part
+
+## [v2.0y] - 2010-10-11
+
+### Fixed
+- Bug with `tight-spacing` option
+
+## [v2.0x] - 2010-10-05
+
+### Fixed
+- Make single-prefix detection work with non-symbolic prefixes
+  (issue #81)
+
+## [v2.0w] - 2010-09-29
+
+### Fixed
+- Problem with REVTeX and S columns (issue #80)
+
+## [v2.0v] - 2010-09-26
+
+### Changed
+- Track `expl3` changes
+
+## [v2.0u] - 2010-09-14
+
+### Fixed
+- Issue with `textpos` (issue #74)
+- Prevent infinite loop when using `\SI{}{...}` (issue #78)
+
+## [v2.0t] - 2010-08-24
+
+### Fixed
+- Correct `\exp_after:wN` (issue #77)
+
+## [v2.0s] - 2010-08-12
+
+### Added
+- Demo for headers in tables
+
+### Fixed
+- Bug in rounding code for zero decimal place (issue #76)
+
+## [v2.0r] - 2010-08-02
+
+### Fixed
+- Bug in v1 `decimalsymbol` emulation
+
+## [v2.0q] - 2010-07-29
+
+### Fixed
+- Errors with free-standing units
+
+## [v2.0p] - 2010-07-28
+
+### Fixed
+- Shape detection
+
+## [v2.0o] - 2010-07-22
+
+### Added
+- Extend detect-italic to slanted shape (issue #73)
+
+## [v2.0n] - 2010-07-15
+
+### Added
+- Various abbreviations
+
+### Changed
+- Documentation section on tables where rows have different units
+
+## [v2.0m] - 2010-07-09
+
+### Added
+- Option `locale` and notes on use with `babel`
+
+## [v2.0l] - 2010-07-07
+
+### Changed
+- Updated documentation for v1 options
+
+### Fixed
+- Move test for `\fg` so that it works independent of `babel` load order
+
+## [v2.0k] - 2010-07-04
+
+### Fixed
+- Issue with `babel` (issue #68)
+
+## [v2.0j] - 2010-06-30
+
+### Changed
+- Force `input-symbols` to print in math mode
+
+### Fixed
+- Correct appearance of `\hartree`
+
+## [v2.0i] - 2010-06-29
+
+### Fixed
+-  Two missed `_` from `expl3` style switch (issue #67)
+
+## [v2.0h] - 2010-06-29
+
+### Fixed
+- Issue with localisation
+
+## [v2.0g] - 2010-06-28
+
+### Added
+- First approach to localisation (issue #61)
+- Restore 'bracket-numbers' option (issue #65)
+
+### Changed
+- Alter complex root output so that it always resets the math font
+
+### Fixed
+- Bracket complex numbers in numerator of quotient (issue #66)
+
+## [v2.0f] - 2010-06-27
+
+### Fixed
+- Spacing with `\times` in text mode (issue #64)
+
+## [v2.0e] - 2010-06-20
+
+### Fixed
+- Move save/restore of `\pm` (issue #58)
+
+## [v2.0d] - 2010-06-10
+
+### Changed
+- Document use of `\cr` in tables (issue #53)
+- Internal `expl3` improvements
+
+### Fixed
+- `table-exponent` option's handling of exponent signs (issue #56)
+
+## [v2.0c] - 2010-06-07
+
+### Changed
+- Improve emulation of v1 material
+- Performance improvements
+- Internal `expl3` improvements
+- Move `\requiresiconfigs` to v1 file
+
+### Fixed
+- Test for bottoming-out units and ensure that any 'hidden' literal units
+  print (issue #50)
+
+## [v2.0b] - 2010-06-01
+
+### Added
+- Complete emulation of v1 options
+
+## [v2.0a] - 2010-05-28
+
+### Changed
+- Allow `\SendSettingsToPgf` in the document body
+- Several improvements in v1 emulation
+
+### Fixed
+- Allow `\newunit` to take optional arguments (issue #45)
+
+## v2.0
+
+### Added
+- Complete re-write of package to add many new features
+
+## v1.0
+
+### Added
+- First official release
+
+## v0.6
+
+### Added
+- First public testing release (as `si`)
+
+[Unreleased]: https://github.com/josephwright/siunitx/compare/v2.8b...stable
+[v2.8b]: https://github.com/josephwright/siunitx/compare/v2.8a...v2.8b
+[v2.8a]: https://github.com/josephwright/siunitx/compare/v2.8...v2.8a
+[v2.8]: https://github.com/josephwright/siunitx/compare/v2.7u...v2.8
+[v2.7v]: https://github.com/josephwright/siunitx/compare/v2.7u...v2.7v
+[v2.7u]: https://github.com/josephwright/siunitx/compare/v2.7t...v2.7u
+[v2.7t]: https://github.com/josephwright/siunitx/compare/v2.7s...v2.7t
+[v2.7s]: https://github.com/josephwright/siunitx/compare/v2.7r...v2.7s
+[v2.7r]: https://github.com/josephwright/siunitx/compare/v2.7q...v2.7r
+[v2.7q]: https://github.com/josephwright/siunitx/compare/v2.7p...v2.7q
+[v2.7p]: https://github.com/josephwright/siunitx/compare/v2.7o...v2.7p
+[v2.7o]: https://github.com/josephwright/siunitx/compare/v2.7n...v2.7o
+[v2.7n]: https://github.com/josephwright/siunitx/compare/v2.7m...v2.7n
+[v2.7m]: https://github.com/josephwright/siunitx/compare/v2.7l...v2.7m
+[v2.7l]: https://github.com/josephwright/siunitx/compare/v2.7k...v2.7l
+[v2.7k]: https://github.com/josephwright/siunitx/compare/v2.7j...v2.7k
+[v2.7j]: https://github.com/josephwright/siunitx/compare/v2.7i...v2.7j
+[v2.7i]: https://github.com/josephwright/siunitx/compare/v2.7h...v2.7i
+[v2.7h]: https://github.com/josephwright/siunitx/compare/v2.7g...v2.7h
+[v2.7g]: https://github.com/josephwright/siunitx/compare/v2.7f...v2.7g
+[v2.7f]: https://github.com/josephwright/siunitx/compare/v2.7e...v2.7f
+[v2.7e]: https://github.com/josephwright/siunitx/compare/v2.7d...v2.7e
+[v2.7d]: https://github.com/josephwright/siunitx/compare/v2.7c...v2.7d
+[v2.7c]: https://github.com/josephwright/siunitx/compare/v2.7b...v2.7c
+[v2.7b]: https://github.com/josephwright/siunitx/compare/v2.7a...v2.7b
+[v2.7a]: https://github.com/josephwright/siunitx/compare/v2.7...v2.7a
+[v2.7]: https://github.com/josephwright/siunitx/compare/v2.6s...v2.7
+[v2.6s]: https://github.com/josephwright/siunitx/compare/v2.6r...v2.6s
+[v2.6r]: https://github.com/josephwright/siunitx/compare/v2.6q...v2.6r
+[v2.6q]: https://github.com/josephwright/siunitx/compare/v2.6p...v2.6q
+[v2.6p]: https://github.com/josephwright/siunitx/compare/v2.6o...v2.6p
+[v2.6o]: https://github.com/josephwright/siunitx/compare/v2.6n...v2.6o
+[v2.6n]: https://github.com/josephwright/siunitx/compare/v2.6m...v2.6n
+[v2.6m]: https://github.com/josephwright/siunitx/compare/v2.6l...v2.6m
+[v2.6l]: https://github.com/josephwright/siunitx/compare/v2.6k...v2.6l
+[v2.6k]: https://github.com/josephwright/siunitx/compare/v2.6j...v2.6k
+[v2.6j]: https://github.com/josephwright/siunitx/compare/v2.6i...v2.6j
+[v2.6i]: https://github.com/josephwright/siunitx/compare/v2.6h...v2.6i
+[v2.6h]: https://github.com/josephwright/siunitx/compare/v2.6g...v2.6h
+[v2.6g]: https://github.com/josephwright/siunitx/compare/v2.6f...v2.6g
+[v2.6f]: https://github.com/josephwright/siunitx/compare/v2.6e...v2.6f
+[v2.6e]: https://github.com/josephwright/siunitx/compare/v2.6d...v2.6e
+[v2.6d]: https://github.com/josephwright/siunitx/compare/v2.6c...v2.6d
+[v2.6c]: https://github.com/josephwright/siunitx/compare/v2.6b...v2.6c
+[v2.6b]: https://github.com/josephwright/siunitx/compare/v2.6a...v2.6b
+[v2.6a]: https://github.com/josephwright/siunitx/compare/v2.6...v2.6a
+[v2.6]: https://github.com/josephwright/siunitx/compare/v2.5s...v2.6
+[v2.5s]: https://github.com/josephwright/siunitx/compare/v2.5r...v2.5s
+[v2.5r]: https://github.com/josephwright/siunitx/compare/v2.5q...v2.5r
+[v2.5q]: https://github.com/josephwright/siunitx/compare/v2.5p...v2.5q
+[v2.5p]: https://github.com/josephwright/siunitx/compare/v2.5o...v2.5p
+[v2.5o]: https://github.com/josephwright/siunitx/compare/v2.5n...v2.5o
+[v2.5n]: https://github.com/josephwright/siunitx/compare/v2.5m...v2.5n
+[v2.5m]: https://github.com/josephwright/siunitx/compare/v2.5l...v2.5m
+[v2.5l]: https://github.com/josephwright/siunitx/compare/v2.5k...v2.5l
+[v2.5k]: https://github.com/josephwright/siunitx/compare/v2.5j...v2.5k
+[v2.5j]: https://github.com/josephwright/siunitx/compare/v2.5i...v2.5j
+[v2.5i]: https://github.com/josephwright/siunitx/compare/v2.5h...v2.5i
+[v2.5h]: https://github.com/josephwright/siunitx/compare/v2.5g...v2.5h
+[v2.5g]: https://github.com/josephwright/siunitx/compare/v2.5f...v2.5g
+[v2.5f]: https://github.com/josephwright/siunitx/compare/v2.5e...v2.5f
+[v2.5e]: https://github.com/josephwright/siunitx/compare/v2.5d...v2.5e
+[v2.5d]: https://github.com/josephwright/siunitx/compare/v2.5c...v2.5d
+[v2.5c]: https://github.com/josephwright/siunitx/compare/v2.5b...v2.5c
+[v2.5b]: https://github.com/josephwright/siunitx/compare/v2.5a...v2.5b
+[v2.5a]: https://github.com/josephwright/siunitx/compare/v2.5...v2.5a
+[v2.5]: https://github.com/josephwright/siunitx/compare/v2.4n...v2.5
+[v2.4n]: https://github.com/josephwright/siunitx/compare/v2.4m...v2.4n
+[v2.4m]: https://github.com/josephwright/siunitx/compare/v2.4l...v2.4m
+[v2.4l]: https://github.com/josephwright/siunitx/compare/v2.4k...v2.4l
+[v2.4k]: https://github.com/josephwright/siunitx/compare/v2.4j...v2.4k
+[v2.4j]: https://github.com/josephwright/siunitx/compare/v2.4i...v2.4j
+[v2.4i]: https://github.com/josephwright/siunitx/compare/v2.4h...v2.4i
+[v2.4h]: https://github.com/josephwright/siunitx/compare/v2.4g...v2.4h
+[v2.4g]: https://github.com/josephwright/siunitx/compare/v2.4f...v2.4g
+[v2.4f]: https://github.com/josephwright/siunitx/compare/v2.4e...v2.4f
+[v2.4e]: https://github.com/josephwright/siunitx/compare/v2.4d...v2.4e
+[v2.4d]: https://github.com/josephwright/siunitx/compare/v2.4c...v2.4d
+[v2.4c]: https://github.com/josephwright/siunitx/compare/v2.4b...v2.4c
+[v2.4b]: https://github.com/josephwright/siunitx/compare/v2.4a...v2.4b
+[v2.4a]: https://github.com/josephwright/siunitx/compare/v2.4...v2.4a
+[v2.4]: https://github.com/josephwright/siunitx/compare/v2.3h...v2.4
+[v2.3h]: https://github.com/josephwright/siunitx/compare/v2.3g...v2.3h
+[v2.3g]: https://github.com/josephwright/siunitx/compare/v2.3f...v2.3g
+[v2.3f]: https://github.com/josephwright/siunitx/compare/v2.3e...v2.3f
+[v2.3e]: https://github.com/josephwright/siunitx/compare/v2.3d...v2.3e
+[v2.3d]: https://github.com/josephwright/siunitx/compare/v2.3c...v2.3d
+[v2.3c]: https://github.com/josephwright/siunitx/compare/v2.3b...v2.3c
+[v2.3b]: https://github.com/josephwright/siunitx/compare/v2.3a...v2.3b
+[v2.3a]: https://github.com/josephwright/siunitx/compare/v2.3...v2.3a
+[v2.3]: https://github.com/josephwright/siunitx/compare/v2.2l...v2.3
+[v2.2l]: https://github.com/josephwright/siunitx/compare/v2.2k...v2.2l
+[v2.2k]: https://github.com/josephwright/siunitx/compare/v2.2j...v2.2k
+[v2.2j]: https://github.com/josephwright/siunitx/compare/v2.2i...v2.2j
+[v2.2i]: https://github.com/josephwright/siunitx/compare/v2.2h...v2.2i
+[v2.2h]: https://github.com/josephwright/siunitx/compare/v2.2g...v2.2h
+[v2.2g]: https://github.com/josephwright/siunitx/compare/v2.2f...v2.2g
+[v2.2f]: https://github.com/josephwright/siunitx/compare/v2.2e...v2.2f
+[v2.2e]: https://github.com/josephwright/siunitx/compare/v2.2d...v2.2e
+[v2.2d]: https://github.com/josephwright/siunitx/compare/v2.2c...v2.2d
+[v2.2c]: https://github.com/josephwright/siunitx/compare/v2.2b...v2.2c
+[v2.2b]: https://github.com/josephwright/siunitx/compare/v2.2a...v2.2b
+[v2.2a]: https://github.com/josephwright/siunitx/compare/v2.2...v2.2a
+[v2.2]: https://github.com/josephwright/siunitx/compare/v2.1p...v2.2
+[v2.1p]: https://github.com/josephwright/siunitx/compare/v2.1o...v2.1p
+[v2.1o]: https://github.com/josephwright/siunitx/compare/v2.1n...v2.1o
+[v2.1n]: https://github.com/josephwright/siunitx/compare/v2.1m...v2.1n
+[v2.1m]: https://github.com/josephwright/siunitx/compare/v2.1l...v2.1m
+[v2.1l]: https://github.com/josephwright/siunitx/compare/v2.1k...v2.1l
+[v2.1k]: https://github.com/josephwright/siunitx/compare/v2.1j...v2.1k
+[v2.1j]: https://github.com/josephwright/siunitx/compare/v2.1i...v2.1j
+[v2.1i]: https://github.com/josephwright/siunitx/compare/v2.1h...v2.1i
+[v2.1h]: https://github.com/josephwright/siunitx/compare/v2.1g...v2.1h
+[v2.1g]: https://github.com/josephwright/siunitx/compare/v2.1f...v2.1g
+[v2.1f]: https://github.com/josephwright/siunitx/compare/v2.1e...v2.1f
+[v2.1e]: https://github.com/josephwright/siunitx/compare/v2.1d...v2.1e
+[v2.1d]: https://github.com/josephwright/siunitx/compare/v2.1c...v2.1d
+[v2.1c]: https://github.com/josephwright/siunitx/compare/v2.1b...v2.1c
+[v2.1b]: https://github.com/josephwright/siunitx/compare/v2.1a...v2.1b
+[v2.1a]: https://github.com/josephwright/siunitx/compare/v2.1...v2.1a
+[v2.1]: https://github.com/josephwright/siunitx/compare/v2.0y...v2.1
+[v2.0y]: https://github.com/josephwright/siunitx/compare/v2.0x...v2.0y
+[v2.0x]: https://github.com/josephwright/siunitx/compare/v2.0w...v2.0x
+[v2.0w]: https://github.com/josephwright/siunitx/compare/v2.0v...v2.0w
+[v2.0v]: https://github.com/josephwright/siunitx/compare/v2.0u...v2.0v
+[v2.0u]: https://github.com/josephwright/siunitx/compare/v2.0t...v2.0u
+[v2.0t]: https://github.com/josephwright/siunitx/compare/v2.0s...v2.0t
+[v2.0s]: https://github.com/josephwright/siunitx/compare/v2.0r...v2.0s
+[v2.0r]: https://github.com/josephwright/siunitx/compare/v2.0q...v2.0r
+[v2.0q]: https://github.com/josephwright/siunitx/compare/v2.0p...v2.0q
+[v2.0p]: https://github.com/josephwright/siunitx/compare/v2.0o...v2.0p
+[v2.0o]: https://github.com/josephwright/siunitx/compare/v2.0n...v2.0o
+[v2.0n]: https://github.com/josephwright/siunitx/compare/v2.0m...v2.0n
+[v2.0m]: https://github.com/josephwright/siunitx/compare/v2.0l...v2.0m
+[v2.0l]: https://github.com/josephwright/siunitx/compare/v2.0k...v2.0l
+[v2.0k]: https://github.com/josephwright/siunitx/compare/v2.0j...v2.0k
+[v2.0j]: https://github.com/josephwright/siunitx/compare/v2.0i...v2.0j
+[v2.0i]: https://github.com/josephwright/siunitx/compare/v2.0h...v2.0i
+[v2.0h]: https://github.com/josephwright/siunitx/compare/v2.0g...v2.0h
+[v2.0g]: https://github.com/josephwright/siunitx/compare/v2.0f...v2.0g
+[v2.0f]: https://github.com/josephwright/siunitx/compare/v2.0e...v2.0f
+[v2.0e]: https://github.com/josephwright/siunitx/compare/v2.0d...v2.0e
+[v2.0d]: https://github.com/josephwright/siunitx/compare/v2.0c...v2.0d
+[v2.0c]: https://github.com/josephwright/siunitx/compare/v2.0b...v2.0c
+[v2.0b]: https://github.com/josephwright/siunitx/compare/v2.0a...v2.0b
+[v2.0a]: https://github.com/josephwright/siunitx/compare/v2.0...v2.0a
diff --git a/macros/latex/contrib/siunitx/siunitx.dtx b/macros/latex/contrib/siunitx/siunitx.dtx
index 7609bf7877..bfef3f5f5e 100644
--- a/macros/latex/contrib/siunitx/siunitx.dtx
+++ b/macros/latex/contrib/siunitx/siunitx.dtx
@@ -5225,7 +5225,7 @@ This work consists of the file  siunitx.dtx
 %
 % The usual preliminaries.
 %    \begin{macrocode}
-\ProvidesExplPackage {siunitx} {2020/02/25} {2.8b}
+\ProvidesExplPackage {siunitx} {2021/03/27} {2.8c}
   {A comprehensive (SI) units package}
 %    \end{macrocode}
 %
@@ -5279,6 +5279,15 @@ This work consists of the file  siunitx.dtx
 \RequirePackage{ amstext , array , l3keys2e }
 %    \end{macrocode}
 %
+% \begin{macro}{@@_if_hooks:TF}
+%   To work with updated hooks if available.
+%    \begin{macrocode}
+\@ifl@t@r \fmtversion { 2020-10-01 }
+  { \cs_new_eq:NN \@@_if_hooks:TF \use_i:nn }
+  { \cs_new_eq:NN \@@_if_hooks:TF \use_ii:nn }
+%    \end{macrocode}
+% \end{macro}
+%
 %\begin{macro}{\@@_tmp:w}
 % A scratch function.
 %    \begin{macrocode}
@@ -5750,11 +5759,21 @@ This work consists of the file  siunitx.dtx
       }
   \group_end:
 }
-\tl_put_right:Nn \document
+\@@_if_hooks:TF
+  {
+    \AddToHook { begindocument / end } [ siunitx ]
+      {
+        \@@_set_math_fam:n { sf }
+        \@@_set_math_fam:n { tt }
+      }
+  }
   {
-    \@@_set_math_fam:n { sf }
-    \@@_set_math_fam:n { tt }
-    \ignorespaces
+    \tl_put_right:Nn \document
+      {
+        \@@_set_math_fam:n { sf }
+        \@@_set_math_fam:n { tt }
+        \ignorespaces
+      }
   }
 %    \end{macrocode}
 %\end{macro}
@@ -11572,7 +11591,18 @@ This work consists of the file  siunitx.dtx
   \tl_map_function:nN { \bar \color \ng \pm \array@row@rst }
     \@@_protect_symbols:N
 }
-\tl_put_right:Nn \document { \@@_protect_symbols:N \fg }
+\@@_if_hooks:TF
+  {
+    \AddToHook { begindocument / end } [ siunitx ]
+      { \@@_protect_symbols:N \fg }
+  }
+  {
+    \tl_put_right:Nn \document
+      {
+        \@@_protect_symbols:N \fg
+        \ignorespaces
+      }
+  }
 \cs_new_protected:Npn \@@_protect_symbols:N #1 {
   \cs_if_exist:NT #1
     {
@@ -15987,38 +16017,6 @@ This work consists of the file  siunitx.dtx
 % \pkg{hyperref}, and ensure that everything works cleanly and with
 % no unnecessary warnings.
 %
-% \begin{macro}{\@@_contents_add:N}
-%   An updated version of \cs{addtocontents} which will ensure that
-%   everything works properly. Using \cs{token_to_str:N} means that
-%   there is no problem with the asynchronous nature of \TeX{}'s writing
-%   mechanism.
-%    \begin{macrocode}
-\AtBeginDocument
-  {
-    \cs_set:Npn \addtocontents #1#2
-      {
-        \protected@write \@auxout
-          {
-            \cs_set_eq:NN \label    \use_none:n
-            \cs_set_eq:NN \index    \use_none:n
-            \cs_set_eq:NN \glossary \use_none:n
-            \seq_map_inline:Nn \l_siunitx_unit_symbolic_seq
-              { \@@_contents_add:N ##1 }
-          }
-          { \token_to_str:N \@writefile {#1} {#2} }
-      }
-  }
-\cs_new_protected:Npn \@@_contents_add:N #1
-  {
-    \cs_set:Npn #1
-      {
-        \token_to_str:N #1
-        \c_space_tl
-      }
-  }
-%    \end{macrocode}
-% \end{macro}
-%
 % \begin{macro}{\@@_contents_bookmarks:}
 %   The idea here is two-fold. First, all of the unit macros are set
 %   up to simply print their literal interpretation: this is hopefully
diff --git a/macros/latex/contrib/siunitx/siunitx.pdf b/macros/latex/contrib/siunitx/siunitx.pdf
index fa11c665ec..ce6e9ef0f6 100644
--- a/macros/latex/contrib/siunitx/siunitx.pdf
+++ b/macros/latex/contrib/siunitx/siunitx.pdf