//
//	if (exception) {
//	  15..4  unsigned exception index
//	} else {
//	  15..8  XOR pattern or index to XOR pattern for case mapping
//	         Only 13..8 are used for XOR patterns.
//	      7  inverseFold (fold to upper, not to lower)
//	      6  index: interpret the XOR pattern as an index
//	         or isMid if case mode is cIgnorableUncased.
//	   5..4  CCC: zero (normal or break), above or other
//	}