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[x] stream: lazy allocate

Rodrigo Muino Tomonari requested to merge github/fork/nxtedition/stream-lazy-allocate into master

Lazy allocate potentially unused state objects.

 streams/creation.js kind='duplex' n=1000000           ***      5.57 %       ±1.65% ±2.21% ±2.89%
 streams/creation.js kind='readable' n=1000000         ***      6.55 %       ±2.70% ±3.60% ±4.70%
 streams/creation.js kind='transform' n=1000000        ***      2.51 %       ±1.41% ±1.88% ±2.45%
 streams/creation.js kind='writable' n=1000000                  0.04 %       ±1.60% ±2.13% ±2.79%
Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • documentation is changed or added
  • commit message follows commit guidelines

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