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Previously, flushing on zlib streams was implemented through stream 'drain' handlers. This has a number of downsides; in particular, it is complex, and could lead to unpredictable behaviour, since it meant that in a sequence like ```js compressor.write('abc'); compressor.flush(); waitForMoreDataAsynchronously(() => { compressor.write('def'); }); ``` it was not fully deterministic whether the flush happens after the second chunk is written or the first one. This commit replaces this mechanism by one that piggy-backs along the stream’s write queue, using a “special” `Buffer` instance that signals that a flush is currently due. PR-URL: #23186 Reviewed-By: James M Snell <jasnell@gmail.com>
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