Unicode sequence normalization #24
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It turns out that the so called COMBINING DIAERESIS' (U+0308) is the culprit here. We now normalize the character sequence before we loop over it. This way we ensure not ending up treating the diaeresis as a separate character during looping.
Check https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/normalize#description for more details on the normalization.