[swift-evolution] Proposal: Add a sequence-based initializer to Dictionary

Gregg Wonderly greggwonderly at seqtechllc.com
Fri Jan 5 11:55:35 CST 2018

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.


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