You should be able to supply an argument to //read that tells it if the binary number should be interpreted as two's complement.

Can I be assigned to this issue?
Can someone please explain how the workflow with Github and Minecraft modding goes? I am new to both and would like to try something out.

best approach would probably be to make the number argument type interpret binary numbers that start with some special prefix (maybe 2b instead of 0b) as 2s complement, that way it could be used anywhere

the above method would make this work with /base too, i wont assign you just yet as there's some changes coming up with how argument types work which may effect your pull request. Once the rewrite is done i'll assign you