It seems it was done to marginally improve serde_derive build times? And just on x86_64-unknown-linux-gnu?
It feels a pretty weird course of action, even if I can understand his point of view his official stance of “My way or the highway” seems a bit stronger than needed, especially considering the amount of problems - both moral and pratical - this modification arises.
I don’t know. If he really feel so strongly about it the only real option would be an hard fork, but a project of that magnitudo and so integrated in the ecosystem is really not easy to both manage or substitute.
Overall it kind of leave a sour taste, even if - I repeat - I understand it is his time and his decision to make.
OT, but remember you can always use an archived link instead of a live one.