Support wp_cache_get_multiple

[bueltge]

Available since WP 5.5, see https://make.wordpress.org/core/2020/08/11/introduce-wp_cache_get_multiple/

[Biont]

We can implement this, but it needs to be stated that won't make a practical difference: WP Core provides a fallback shim that simply wraps multiple wp_cache_get calls. And guess what: Stash does the same thing!

It is still a good idea to support this so that we are forward compatible in the event that Stash adds support for this, but I don't see that happening soon. I could not even find an open issue for this apart from this seven-year old issue

[bueltge]

So we should leave it for now, maybe StashPHP will support it later, and then is the effort helpful.

[Biont]

It doesn't take much effort to do it now and allowed me to do some welcome house cleaning

[bueltge]

So feel free to do them. However, I understand that the benefit of this function is less. But housekeeping is more helpful. ;)