i have a class that wraps a stream producer and ul...

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[danneu]

i have a class that wraps a stream producer and ultimately `.pipe()`s the stream somewhere. however, in some cases, i need to reify the stream into a bytearray, like imagine the toy case where the user wants to know the length of the stream before piping it . i'd like .pipe() to basically go "if bytearray exists, pipe the bytearray. else, produce and pipe the stream". the objective being to avoid doing the work of producing the stream twice.