Commits on Oct 7, 2018

1. zlib: simplify flushing mechanism …

   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.

   

   addaleax committed Oct 7, 2018
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