11. How do we track publisher sales activity? Publishers can be identified by their publisher ID, which is used in tracking cookies to determine which publishers generate sales. The activity is then viewed within a network's dashboard.
.pipeThrough(parse) // buffers filling...
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tee() splits a stream into two branches. It seems straightforward, but the implementation requires buffering: if one branch is read faster than the other, the data must be held somewhere until the slower branch catches up.
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