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Given a specific key, produces a Lens from a Map to an Option. When setting,
a Some(value) will insert or replace the value into the map at the given key. Setting a value of
None will delete the value at the specified key. Works well together with non.
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i
:
'a
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f
:
'b option -> ^c
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t
:
Map<'a, 'b>
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Returns:
'd
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