[swift-evolution] protocol-oriented integers (take 2)

[Xiaodi Wu]

[Resending to list with original message removed for length.]

This is fantastic. Glad to see it take shape. Very neat and insightful to
have trailingZeros on BinaryInteger but leadingZeros on FixedWidthInteger.
A couple of questions on smart shifts: What is the performance penalty as
compared to the existing operators? Beyond performance, what are the
implications for migrating existing bit twiddling algorithms written in
Swift 3?
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