agronholm / anyio / 37354572450

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Reject NaN deadlines on asyncio to match Trio (#1317)

CancelScope on Trio raises ValueError for a NaN deadline; on asyncio the NaN was stored as-is. Every deadline comparison against NaN is false, so the scope simply never fired: fail_after(math.nan) returned instead of raising TimeoutError, and move_on_after(math.nan) never cancelled.

This is the same backend inconsistency #1307 fixed for sleep(), on the five remaining public surfaces that take a deadline or delay: CancelScope(deadline=...), the deadline setter, move_on_at, fail_at, move_on_after and fail_after.

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Co-authored-by: Claude Opus 5 <noreply@anthropic.com>
Co-authored-by: Alex Grönholm <alex.gronholm@nextday.fi>

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