Technically it is MoarVM that handles graphemes as synthetic codepoints.

We call it NFG for Normalized Form Grapheme.

The JVM and JavaScript backends currently use the built-in string handling features. Which means that they are just as broken as the rest of the code running on them.

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Of further note, you can use ignorecase in regexes to match "baffle".

    "baffle" ~~ /:ignorecase  BAFfLE  /;