In some dictionary implementations, key-value pairs are added with an add()
method which disallows duplicate keys to be inserted with a runtime exception.
Providing an additional method of set() allows for the ability to ignore
duplicate keys so that it feels more like dict[key] = value. It might be
interesting to provide this as a selectable behavior within an additional
constructor's arguments.
Dictionary(allowDuplicate: true, pairs: [("z", 1), ("z", 2), ("z", 3), ("z",
4)]) so that the dictionary behavior remains in line with the compile time
checks.
Gregg
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