private static int determineBitness() {
		// Parse from specification value, which is commonly defined.
		String bitness = System.getProperty("sun.arch.data.model", "");
		if (bitness.matches("[0-9]{2}"))
			return Integer.parseInt(bitness, 10);
		// Parse from IBM value, used on IBM releases.
		bitness = System.getProperty("com.ibm.vm.bitmode", "");
		if (bitness.matches("[0-9]{2}"))
			return Integer.parseInt(bitness, 10);
		return OS_ARCH.contains("64") ? 64 : 32;
	}
@return {@code 64} or {@code 32} dependent on the {@link #OS_ARCH}.
recaf-core/src/main/java/software/coley/recaf/analytics/SystemInformation.java