Signed integers are wrong

[evmar]

https://evmar.github.io/weave/?wasm/gioui-demo.wasm#function=996

Ben says: "I'm fairly certain the i64.const 127 should be i64.const -1 or else this function makes no sense"

[appcypher]

I don't think there is a solution to that since wasm only cares about signedness for operators.
Perhaps showing the unsigned and two complements signed value would make more sense.

[evmar]

The problem here is that I currently deserialize signed values wrong, it’s part of the format.