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class_implements
accepts either an object or a class-string, but the PHPDoc for the assert function is wrong and limits its functionality to a class-string only. I'm not entirely sure if this was on purpose, the README just mentions "Check that a class implements an interface", but it would work with either an instance of a class or a class-string and the assertion is under the "object" category.See also https://phpstan.org/r/c72bb8af-4f27-462b-85f6-e2d3b81b9786 where this is tested in PHPStan (which just got support for PHPDoc-based type narrowing, this is not released yet)
Refs: phpstan/phpstan-webmozart-assert#144 (comment)
I could not cleanly run psalm locally without unrelated errors, let's see what happens on CI 🤞