fiber_map

FiberMap[K, A, E]: at most one fiber per key, inside one scope.

Running or setting a fiber under a key that holds another interrupts the old one (only_if_missing=True keeps it and interrupts the newcomer instead). Each fiber leaves the map when it completes; replaced fibers stay owned until they finish interrupting, so closing the scope waits for their cleanup too. join fails with the first member failure; interrupts only count with propagate_interruption=True, and never those the map sends itself (replacing, remove, clear).

runtime(*tags) returns a runner that forks root fibers into the map from plain code, as Effect's FiberMap.runtime.

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