@Override
	public long sizeOf(Pair<L, R> value) {
		return leftArith.sizeOf(value.getLeft());
		// TODO: Assert that the right agrees? Nah. Some aux types have no size.
	}
Construct a composed arithmetic from the given two

@param leftArith the left ("control") arithmetic
@param rightArith the right ("rider") arithmetic
Ghidra/Framework/Emulation/src/main/java/ghidra/pcode/exec/PairedPcodeArithmetic.java