I'd like to propose extending the API for Keyword and Map, fetch! method:
Map.fetch!(%{a: 1}, :b, 2) => 2
Keyword.fetch!([a: 1], :b, 2) => 2
Third argument represents value which will be returned in case the
requested key is missing. Optionally maybe it could also accept the
function which is executed only in case the key is missing and it's return
value is used.
It would allow a simple way to fallback to default option values.
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