Assert validity on the raw socket in SockRef::from #253
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Since we now use the niche feature on Unix it's unsound to use
SockRef::from(-1), but it can be done without any unsafe. This change
adds an assertion to ensure we hit this soundness issue.
Still need to wait on the I/O safety RFC:
https://github.com/rust-lang/rfcs/blob/master/text/3128-io-safety.md
Tracking issue: rust-lang/rust#87074
Implementation pr: rust-lang/rust#87329
Closes #229 (again)
Updates #218
Closes #244