Well, backwards compatibility is really a spectrum and the interpretation of the concept can fall at either end of the spectrum depending on what a person is wo

Well, backwards compatibility is really a spectrum and the interpretation of the concept can fall at either end of the spectrum depending on what a person is working on. As far as wasm is concerned, there are at least two known discrepancies that made into this draft as documented here https://github.com/WebAssembly/spec/issues/1439 https://github.com/WebAssembly/spec/issues/1439. Especially the last comment by Alex here seems interesting to me – on one hand the observable result of the execution changes for the same program. On another, who is going to bother writing such programs? Should WebAssembly specification be allowed to assume nobody does and make changes such as these?