Bug with skin tone emojis when using `prevGraphemeClusterBreak` package
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JavaScript
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Description
There's an issue with `prevGraphemeClusterBreak` package, if I compare the results with `nextGraphemeClusterBreak` for a single skin tone emoji it doesn't return the same values,
```
prevGraphemeClusterBreak( '👉🏿' ) // returns 1
nextGraphemeClusterBreak( '👉🏿' ) // returns -1
```
_Originally posted by @steff456 in https://github.com/stdlib-js/stdlib/pull/1079#discussion_r1306328286_
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