Enum case as Array key?

Description

Before enum exist, i used constant to define the array key. Now i want to use enum. But i got error when i declare the enum as array key. so i do the workaround like this:

if (!function_exists('_api')) {
    /**
     * use enum as Array Key.
     *
     * @param array $values
     * @param \App\Enums\Api\ResponseKey $key
     * @param mixed $data
     * @return array
     */
    function _api(?array &$values, ResponseKey $key, $data)
    {
        if (! is_array($values)) $values = [];

        $values[$key->value] = $data;

        return $values;
    }
}

Then call it like _api($data, ResponseKey::message, "success");

Can this workaround can be implemented as feature for future PHP?

No files or tests are named. Start by reading the issue discussion and reviewing PHP enum and array-key behavior, then locate the relevant language implementation and regression tests. Done would require an agreed language design and implementation with coverage for the intended enum-key behavior.