checkForNFC(quickCheck:)
Do a scan checking for whether the contents are in Normal Form C. When the contents are in NFC, canonical equivalence checks are much faster.
Declaration
mutating func checkForNFC(quickCheck: Bool) -> BoolDiscussion
quickCheck will check for a subset of NFC contents using the NFCQuickCheck algorithm, which is faster than the full normalization algorithm. However, it cannot detect all NFC contents.
Updates the isKnownNFC bit.