check composition exclusions in is_already_nfc - #89
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is_already_nfc in src/normalization.cpp treats any character with a canonical decomposition longer than one code point as already NFC, which skips composition exclusions and non-starter decompositions whose NFC form is decomposed: U+0958 normalizes to U+0915 U+093C, U+1F71 to U+03AC, and U+0344 to U+0308 U+0301. For those the quick check returns true, so a direct normalize() leaves the string unnormalized and is_already_nfc misreports its result. The fix recomposes each character's canonical decomposition and keeps the fast path only when it collapses back to the original code point.