public static DWARFIdentifierCase find(long key) {
		DWARFIdentifierCase access = valueMap.get((int) key);
		if(access != null)
			return access;
		throw new IllegalArgumentException("Invalid Integer value: " + key);
	}
Find the identifier case value given a Number value.
@param key Number value to check
@return DWARFIdentifierCase enum if it exists
@throws IllegalArgumentException if the key is not found
Ghidra/Features/Base/src/main/java/ghidra/app/util/bin/format/dwarf/DWARFIdentifierCase.java