Python ignores grapheme cluster, that point was about my original test case using grapheme clusters I later found out had precomposed equivalent, so a transfer chain performing NFC would leave the test case with no combining characters (or multi-codepoint grapheme clusters) left in it.
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I don't think so. In my tests standard python (2.7 and 3.5) ignores grapheme clusters.
Python ignores grapheme cluster, that point was about my original test case using grapheme clusters I later found out had precomposed equivalent, so a transfer chain performing NFC would leave the test case with no combining characters (or multi-codepoint grapheme clusters) left in it.
Gotchya.