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

[Brent Royal-Gordon]

> One caveat is that the new initializer doesn't prevent using a sequence with multiple identical keys. In such a case, the last key/value would "win" and exist in the dictionary.

Another alternative would be to make the initializer failable and have it fail if a key is duplicated.

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Brent Royal-Gordon
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