coroutines

A library for creating and composing producer/transformer/consumer coroutines. Producers are already provided by Ruby's built-in Enumerator class; this library provides Transformer and Consumer classes that work analogously. In particular, they are also based on Fiber and not on threads (as in some other producer/consumer libraries). Also provides a module Sink, which is analogous to Enumerable, and Enumerable/Transformer/Sink composition.