improve codebase and performance

[Uzlopak]

before:

  no header   x 9,918,143 ops/sec ±0.41% (193 runs sampled)
  1 address   x 6,509,341 ops/sec ±0.59% (190 runs sampled)
  2 addresses x 3,776,782 ops/sec ±1.24% (188 runs sampled)
  5 addresses x 2,228,356 ops/sec ±0.28% (181 runs sampled)

after:

no header   x 1,246,115,625 ops/sec ±0.24% (196 runs sampled)
  1 address   x    66,139,899 ops/sec ±0.91% (193 runs sampled)
  2 addresses x    10,107,089 ops/sec ±0.34% (195 runs sampled)
  5 addresses x     4,374,716 ops/sec ±0.48% (194 runs sampled)

[Uzlopak]

I was actually investigating if i could improve the original package of dougwilson. Then i saw you already created a fork. I hope you like it...

[Uzlopak]

@Fdawgs
@mcollina
@Eomm
@kibertoad

[Fdawgs]

Disgusting, lgtm

[Uzlopak]

@Fdawgs

Thank you xD. I added some unit tests for some edge cases, just to be on the safe side. Please just run the workflows again ;)

I even had a faster implementation, but that would have been a security risk, as it would use recursion. And Forwarded-For is a security header, so I didnt wanted that somebody could raise a MaxStackCall Error and poitentially crashing the service.