cod10129

Changing this function to only accept an internal trait for `NodeIndex` and `EdgeIndex` would not be breaking any sensible users of `petgraph`. A user's type can `impl IndexMut for Graph`,...

Yes it is. Sorry I didn't see that earlier. I'll close this issue and move any of my further thoughts over there.

As Github has noted above, I just made [a patch](https://github.com/cod10129/rust/commit/b1f21a9d6c0e0e0767789870318ace2c21d3df3d) to support this. Most of the effort was in the `.zed/settings.json` that I copied from the OP of this issue....

I wrote all that out about it and forgot to actually require `CheckedRem`. I think my idea was that I'm not sure what should happen with it. `CheckedNumOps` could *not*...