Issue in action update*_{$meta_type}_meta

[SGr33n]

Hi,

I'm just working on a plugin that make use of updated_{$meta_type}_meta action (updated_user_meta in my case), but looks like this action doesn't completely work.

Taking a look at the code here https://core.trac.wordpress.org/browser/tags/4.7.3/src/wp-includes/meta.php#L267 I see in the related code that there is a foreach loop through meta_ids, but the called action also defines a $meta_key and a $_meta_value that are not looping, so they would always have the same value, even if the meta key is changing. This would happen if, e.g., that action is called after the user updated a few profile fields from the WordPress backend. Is this a bug?

Thanks.

[SGr33n]

Tested more in deep, my fault.
Works good.