agronholm / anyio / 27972812691

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Allow 0 tokens in a CapacityLimiter instantiated outside an event loop (#1183)

PR #1019 allowed setting a CapacityLimiter's total tokens to 0 (released in 4.12), updating both the docstring and the asyncio backend setter. However, the CapacityLimiterAdapter.total_tokens setter - used whenever a CapacityLimiter is instantiated outside of a running event loop - was missed and still rejected 0 with "total_tokens must be >= 1".

This made CapacityLimiter(0) and limiter.total_tokens = 0 raise ValueError when created outside an event loop, contradicting the documented behavior.

Align the adapter setter with the backend setter (value < 0) and add a regression test covering the outside-event-loop path.

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