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5 documented functions, and one documented property. This is probably one of the most minimal/clean API's I have seen.

I'm really alien to the concept and to the library itself, but still

minimal/clean ≠ not complex

Like monads, this is rather abstract, although simple. As abstractions accumulate in layers, the thing becomes harder to understand.

I think working with Rx and these streams in general takes getting used to, but it's such a useful concept to learn for its own sake.