PHP 8.0 and PHP 8.1 support, BetterReflection 5.x upgrade#324

Merged

Ocramius merged 13 commits into6.0.xfrom feature/php-8-compatibility

Dec 6, 2021

+1,860-1,286

Commits on Dec 5, 2021

PHP 8 support and BetterReflection 5.x upgrade
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Ensure IteratorAggregate is implemented exactly as it is in PHP 8.1 tentative types
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Applied automated CS fixes
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Upgraded to azjezz/psl, which should fix php:8.1.0 compatibility
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Prevent installation with incompatible symfony/process versions
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Upgraded roave/better-reflection to be compatible with Roave/BetterReflection@1f7a13b
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Restricting internal types usages to tests/, included psalm/plugin-phpunit
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Implemented covariance/contravariance checks for the new mixed and never types
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Implemented variance checks for union types
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Implemented variance checks for intersection types
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Added tests for nullability + union types variance checks
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Upgraded to latest roave/better-reflection:5.0.x-dev to include Roave/BetterReflection#902
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Removed all code relying on ReflectionType#allowsNull() checks: not necessary with union types
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