DelayedTargetValidation

This attribute delays target validation errors for internal attributes from compile time to when the attribute is instantiated via the Reflection API.

When applied to a declaration, any invalid usage of internal attributes on the same target will not trigger a compile time error. Instead, the validation is deferred and performed when the attribute is instantiated via ReflectionAttribute::newInstance(). This is primarily intended for forward compatibility, allowing code to use attributes that may gain additional valid targets in future PHP versions without breaking on older versions.