signed 2's complement

[Platonic]

gg.loadResults(values)
instructionSet = gg.getResults(2)
if instructionSet[2].value == 0x28 then  -- 0x28
print("32 bit")
elseif instructionSet[2].value == -0x49 then -- 0xB7 | -73 signed 2's complement
print("64 bit")
end

Comparing hex value results in 2's complement, but this is extra struggle because i have to do conversion. I just want to do this:

elseif instructionSet[2].value == 0xB7 then

Possible?