wp-includes/php-ai-client/src/Common/AbstractEnum.php:94Prevents property modification.
$propertystring$valuemixed final public function __set(string $property, $value): void { throw new BadMethodCallException(sprintf('Cannot modify property %s::%s - enum properties are read-only', static::class, $property)); }Introduced in 0.1.0. Unchanged from 7.0.4 through 7.1.0.
Signature, return type and hooks compared across 2 parsed releases.
src/wp-includes/php-ai-client/src/Common/AbstractEnum.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.