thread::ThreadId Display missing

[mitsuhiko]

Currently the thread::ThreadId can only be debug rendered. That's not entirely great because it renders with the ThreadId() thing around. Right now to report the thread ID to sentry we transmute it so we can get the inner u64 out.

Would it be reasonable to have a Display implementation to get a nice string version of the integer in it? There is a bit of precedent for this in Rust: StatusCode in std::process can be displayed and so can be process IDs (which are just u32s).

[frewsxcv]

This may or may not help you, but there's also this which lets you get the pthread_t out of a thread on unix platforms.

[sanmai-NL]

ThreadId does implement Debug, so printing them works somewhat. Can we also have u64 implement From<ThreadId>? Then programmers can do with the number as they like.

[Mark-Simulacrum]

I would personally be against adding the Display impl (I think the one on ExitStatus was not the right move there) and instead provide a function that returns u64, as suggested by @sanmai-NL. It seems likely that thread ids on any platform can be converted to u64, and converting in the other direction seems not helpful.