Runs either the entry or setEntry method, depending on whether messagename ends with an equal sign.

If messagename does not end with an equal sign, this method runs the entry method, passing messagename as its argument. The messageargs argument is ignored. The entry method is the return result.

If messagename does end with an equal sign, this method runs the setEntry method, passing the first part of messagename (up to, but not including, the final equal sign) as its first argument, and the first item in the array messageargs as its second argument. In this case, unknown returns no result.