Techcable

I implemented both your requests. I also moved the new tests to their own file and added tests for coercing weak `Rc` and `Arc` pointers.

Thank you! I would appreciate it if you could make a new release :)

You might want to post syn on the readmee as an alternative.

593bcb087de2d09960aefaccb67d5871ddf4edc8 breaks the unstable feature because you [removed the `nonzero` feature flag](https://github.com/serde-rs/serde/commit/593bcb087de2d09960aefaccb67d5871ddf4edc8#diff-8389c45b09a42b2e6477c9bf6e5dfa71L89) which is still required by `NonZeroU16` and friends.

Thanks so much for the clarification, I didn't realize I was using an outdated nightly!

Clippy has a useful family of lints called [`std_instead_of_core`](https://rust-lang.github.io/rust-clippy/rust-1.82.0/index.html#/std_instead_of_core) and [`std_instead_of_alloc`](https://rust-lang.github.io/rust-clippy/rust-1.82.0/index.html#std_instead_of_alloc) that warn when unnecessarily using `std` types when `alloc` & `core` types would do.

One workaround is `git rebase --force-rebase`