@phpstan-readonly-allow-private-mutation

The @phpstan-readonly-allow-private-mutation tag allows a readonly property to be mutated from within the declaring class, rather than only during initialization. It is defined by the static analyzer PHPStan.

Parsing a @phpstan-readonly-allow-private-mutation tag produces a ReadonlyAllowPrivateMutationTag instance. Being a pure marker, it adds nothing beyond the $name and optional $description every Tag already carries.

The same ReadonlyAllowPrivateMutationTag is produced by @psalm-readonly-allow-private-mutation, which restate the same concept for their respective tools.