Improve perfomance

Hello, i'm author of [`ip2buf`](https://www.npmjs.com/package/ip2buf) - a most faster js library for convering ip to the buffer. Implementation taken from libuv and ported from c++ (by hands, without emscripten). It is possible to join our work?

Some [perf](https://github.com/reklatsmasters/ip2buf/tree/439c55cc7605423929808d42a29b9cd284914cd6/perf) results:

For IPv4:

```
native: 264.411ms
ip2buf: 262.467ms
ipaddr.js: 1512.310ms
ip: 1047.124ms
```

For IPv6:

```
native: 316.183ms
ip2buf: 657.819ms
ipaddr.js: 1691.943ms
ip: 1358.625ms
```

The issue links benchmark results in the ip2buf perf directory but names no node-ip file, test, or concrete change. Start by reviewing the existing conversion entry points and the referenced IPv4 and IPv6 benchmarks; clarify the intended implementation and measurable performance target before work begins.

Written by the indexing model from the issue text.