Simplify little-endian byte conversions

[nlefler]

Use stdlib functions for converting little-endian bytes to single values

[maddyblue]

I'm not convinced this is better. It looks slower, higher memory, and readability is about the same.

[sbinet]

just my 2c, but, it looks like one is doing 4 bound-checks and creating a completely new slice, while the other is doing 2 bound-checks and only sub-slicing (so no allocation of a new backing array)

[nlefler]

I think it reads easier, and the stdlib is well tested. I doubt there are any noticeable performance or memory differences.

[maddyblue]

If you can document some performance improvements I will reconsider this. But it sounds like we disagree about the readability, so I'm not planning on committing this.

[nlefler]

I doubt there will be perf improvements. Closing.