public MaskedLong unknownExtend(int n) {
		long newMsk = zeroExtend(this.msk, n);
		long newVal = zeroExtend(this.val, n);
		return fromMaskAndValue(newMsk, newVal);
	}
Mask out all but the lowest {@code n} bits of the value

@param n the number of bits to take (right-to-left)
@return the unknown-extended masked long
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/app/plugin/assembler/sleigh/expr/MaskedLong.java