Ability to use delimiter without allowing creation

[carissableker]

Currently it is only possible to paste a list of delimiter-separated items or type multiple items separated by the delimiter in a multi-selection control allowing creation (docs).

I would like to enable pasting multiple items, without creating new items that aren't in the initial list of options (e.g. they can be silently discarded).

Is there a limit in the implementation that prevents this?

As a work around, is it possible to pass a create function, that does not actually create the item?