Unicode v1.12.0
Unicode

Unicode.GraphemeClusterBreak.fetch

You're seeing just the function fetch, go back to Unicode.GraphemeClusterBreak module for more information.
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fetch(grapheme_break)

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Returns the Unicode ranges for a given grapheme cluster break as a list of ranges as 2-tuples.

Aliases are resolved by this function.

Returns either {:ok, range_list} or :error.