(edit-if m k f & args)
'Edits' a value in an associative structure, where k is a key and f is a function that will take the old value if it exists and any supplied args and return the new value, and returns a new structure. If the value does not exist returns the structure supplied.
'Edits' a value in an associative structure, where k is a key and f is a function that will take the old value if it exists and any supplied args and return the new value, and returns a new structure. If the value does not exist returns the structure supplied.
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