• Made our __unserialize declarations match PHP 7's, to avoid PHP warnings

• Raised minimum PHP version from 7.0 to 7.2
• Added testing with PHP 7.3, 7.4, 8.0 and 8.1

• Fixed bug in ListPatcher that caused it to compare objects by identity rather than by value
• Add .gitattributes file to exclude not needed files from git exports
• Removed MediaWiki extension registration

• Fixed bug in ListPatcher that caused it to compare objects by identity rather than by value

• Removed MediaWiki extension registration
• Add .gitattributes file to exclude not needed files from git exports

Improvements

• Added return type hints where possible
• Added scalar type hints where possible
• Added strict_types declare statements to all files

Breaking changes

• Dropped support for PHP 5.x
• Dropped class aliases deprecated since Diff 1.0
• Removed ListDiff and MapDiff, deprecated since Diff 0.5
• Removed ListDiffer::MODE_NATIVE and ListDiffer::MODE_STRICT, deprecated since Diff 0.8
• Removed MapDiffer::setComparisonCallback in favour of a new constructor argument

Improved various PHPDocs

• Added Diff::equals
• Removed unused Diff\Appendable interface
• Removed Diff.credits.php
• Changed visibility of most protected fields and methods to private

Internal changes

• bootstrap.php no longer runs composer update
• Added PHPCS and PHPMD support and configuration (phpcs.xml and phpmd.xml)
• Added composer cs command for running the code style checks
• CI now runs composer ci (includes code style checks) instead of phpunit

• Removed not needed support for the MediaWiki i18n system
• Updated the url in Diff.credits.php (used on Special:Version when included with MediaWiki)