arrow-fx / arrow.fx / RacePair / fold
inline fun <C> fold(ifA: (A, Fiber<F, B>) -> C, ifB: (Fiber<F, A>, B) -> C): C
inline fun <C> fold(ifA: (A,
Fiber
<F, B>) -> C, ifB: (
<F, A>, B) -> C): C
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