Improvements 🔧

TypeInferenceTestCase - allow 3rd parties same modern style of type inference testing as in NodeScopeResolverTest (phpstan/phpstan-src@3af8630), documentation: https://phpstan.org/developing-extensions/testing
Dynamic throw type extensions (phpstan/phpstan-src@2bf30bf), #4814, #4819, documentation: https://phpstan.org/developing-extensions/dynamic-throw-type-extensions
Nicer error when StubValidator throws an internal exception (phpstan/phpstan-src@008f324), phpstan/phpstan-symfony#148

Bugfixes 🐛

Fixed === and !== type inference with treatPhpDocTypesAsCertain: false (#476), thanks @ruudk!
Address #4881 by implementing a more complete fake stream wrapper (#501), thanks @rrazor!
Disable OPCache for PHP < 7.4.x, #4881 (#501), thanks @rrazor!
Read PHPDocs for built-in method even if the method has multiple variants (phpstan/phpstan-src@b48fd77), #4821
yield has implicit throw point (phpstan/phpstan-src@033aeff), #4863
Built-in PHP functions without required parameters and no arguments passed do not have implicit throw point (phpstan/phpstan-src@09d3488), #4838
Throwable catch block also uses implicit throw points even when there are explicit ones (phpstan/phpstan-src@54a204e), #4820, #4879
MethodsClassReflectionExtension for SoapClient magic methods (phpstan/phpstan-src@f6107ad), #4822, #262
PHP does not cache is_dir() and similar function values for nonexistent files (phpstan/phpstan-src@1eaef04), #4816
Severity field in GitLab error formatter, GitLab 13.x expects the field in code quality reports (#504), thanks @stockalexander!
Type-specified nullsafe call also removes null from the chain (phpstan/phpstan-src@6622401), #4757, #4690

Dynamic return type extension for date_create_from_format and date_create_immutable_from_format (#502), thanks @pascalheidmann!