public boolean isSigned() {
		switch (subTypeIndex) {
			case 0x8000:
			case 0x8001:
			case 0x8003:
			case 0x8009:
			case 0x8017:
				return true;
			default:
				return false;
		}
	}
Constructor for a Numeric.
@param reader the {@link PdbByteReader} from which to parse the data.
@throws PdbException upon not enough data left to parse.
Ghidra/Features/PDB/src/main/java/ghidra/app/util/bin/format/pdb2/pdbreader/Numeric.java