[swift-evolution] Implicit Type Conversion For Numerics Where Possible.

[Brent Royal-Gordon]

> This is covered under the guise of being able to define a subtype relationship between structs, which is something that I and many other people would love to have, but it is outside the scope of Swift 3.

Should this be on the "Commonly Proposed" list or in the "Out of Scope" list in the Github repo? This topic keeps coming up.

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Brent Royal-Gordon
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