(update [m k f] [m k f x] [m k f x y] [m k f x y z] [m k f x y z & more])'Updates' a value in an associative structure, where k is a
key and f is a function that will take the old value
and any supplied args and return the new value, and returns a new
structure. If the key does not exist, nil is passed as the old value.
Examples
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