public boolean isString() {
		return (mstring != null);
	}
Returns the RTTI number:{0-4, or -1 if not an RTTI}
@return int RTTI number:{0-4, or -1 if not an RTTI}
Ghidra/Features/MicrosoftDmang/src/main/java/mdemangler/naming/MDSpecialName.java