it looks very useful, but I'm having trouble understanding just how it works.
Am I correct in that a filter is expected to accept a string, and return a (probably different) string? And a pump is just "read data from source and write it to sink"?
In toying around with this, I implemented a "tobase64" function. It takes a source and a sink, and keeps reading data from the source until no more is available, converting it to base64, and writing it to the sink. It seems like a simple enough system, able to process large amounts of data without using a lot of memory, and able to be chained (have the source or sink be another such function). But I think this isn't how filters normally work? What's the purpose of separating filter and pump?
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