I have noticed that there are times that based on the get value, there
is no need to update the data, and we have just to pass the same data
back.
So in addition to `:pop` I propose to add `:keep` or `:skip`.
This will optimize things quiet a not only in {Map,
Keyword}.get_and_update/3 but aslo in Access.get_and_update/3 since we
won't have to dispatch and return directly.
Please let me know what you think,
Thank you.
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