[swift-evolution] Synthesizing Equatable, Hashable, and Comparable for tuple types

[Tino Heth]

> Why do you need to have this ability to unsafe bitcast? Is interconversion between point types such a common operation that it's a performance bottleneck?
A real-world example: Real-time image processing.
When you have a stream of 4k pictures at 30 fps, you really don’t wont to copy buffers just because two filters insist on having their own representation of bitmap data.
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