union alloc_header *h;
A branch bank would probably have one, in the back office, used for printing
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Transform backpressure gaps: Pull-through transforms execute on-demand. Data doesn't cascade through intermediate buffers; it flows only when the consumer pulls. Stop iterating, stop processing.
You immediately must scale “the wall” of wrangling the many different pieces to work together. The end result is often only worth it for large projects.