[php-src] PR #20903: GH-10497 (const obj->prop write)

A PHP internals mailing list thread discussing RFC const_object_property_write (PR #20903), which proposes allowing property writes on objects referenced by PHP constants. Currently, writing to CONST_OBJ->prop raises a 'Cannot use temporary expression in write context' error even though the operation mutates the object, not the constant binding. The RFC has evolved through multiple versions: v0.1 included array/dim writes (which were controversial due to silent no-op behavior), v0.2 scoped out array writes to focus only on object property writes, and v0.3 extended coverage to class constants in addition to global constants. A notable edge case is that enum cases are class constants, so writes to readonly enum case properties now raise a runtime readonly-property Error instead of a compile-time error. The RFC targets PHP 8.6 and requires a 2/3 majority vote.

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