Issue #699 since fixed. Nearly a x3 perf improvement.
Using --release-fast.
Sha3_256 (before): 96 Mb/s
Sha3_256 (after): 267 Mb/s
Sha3_512 (before): 53 Mb/s
Sha3_512 (after): 142 Mb/s
No real gains from unrolling other initialization loops in crypto
functions so have been left as is.
The purpose of this is:
* Only one way to do things
* Changing a function with void return type to return a possible
error becomes a 1 character change, subtly encouraging
people to use errors.
See #632
Here are some imperfect sed commands for performing this update:
remove arrow:
```
sed -i 's/\(\bfn\b.*\)-> /\1/g' $(find . -name "*.zig")
```
add void:
```
sed -i 's/\(\bfn\b.*\))\s*{/\1) void {/g' $(find ../ -name "*.zig")
```
Some cleanup may be necessary, but this should do the bulk of the work.
Marc Tiehuis
Andrew Kelley