Addition requires three capabilities:
"The plight of the mackerel is part of a wider failure to take scientific advice intended to keep stocks healthy and able to recover from fishing pressure.
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-> [ anyRcv staticPart: anyArg2 anyKeywordPart: anyArg1 ]
Transforms don't execute until the consumer pulls. There's no eager evaluation, no hidden buffering. Data flows on-demand from source, through transforms, to the consumer. If you stop iterating, processing stops.