Crashes/conversion issues around gender neutral emoji

[eramdam]

The crash

The following snippet (tested on 3.7.0) leads to a crash:

const EmojiConvertor = require('emoji-js')
var emoji = new EmojiConvertor()
 emoji.colons_mode = true
 emoji.replace_unified(`🧑🏻‍🤝‍🧑🏼`)

Uncaught TypeError: Cannot read properties of undefined (reading '3')
    at emoji.replacement (/Users/damien/Developer/Git/xxx/xxx/node_modules/emoji-js/lib/emoji.js:369:50)
    at emoji.replacement (/Users/damien/Developer/Git/xxx/xxx/node_modules/emoji-js/lib/emoji.js:363:17)
    at /Users/damien/Developer/Git/xxx/xxx/node_modules/emoji-js/lib/emoji.js:306:17
    at String.replace (<anonymous>)
    at emoji.replace_unified (/Users/damien/Developer/Git/xxx/xxx/node_modules/emoji-js/lib/emoji.js:284:14)

https://emojipedia.org/people-holding-hands/

As far as I can tell, any gender-neutral variations using skin tone modifiers leads to the crash .

The conversion issue

This one is, I assume a mapping issue(?), but it seems like gender-neutral versions of some single-person emoji are converted into :woman-* instead of :person-*.
A few examples:

> emoji.replace_unified(`🙅`)
':woman-gesturing-no:'
> emoji.replace_unified(`🙎`)
':woman-pouting:'