vapor/vapor 4.0.0-rc.3.5

Provide the hex encoding utilities on Sequences

on GitHub

This patch was authored and released by @gwynne.

• Might as well let Sequences have them as well as Collections
• Make hexEncodedBytes() public, why wouldn't it be?
• Specialize hexEncodedBytes() on Collection to use a (theoretically) more efficient method. It's probably a completely unmeasurable difference in practice.
• Add unit test to make sure it works on Sequences properly. (Sure, it crashes if you try something like sequence(0) { $0 + 1 }.hex, but that's to be expected. Maybe at some point a length limit check can be added.)