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stream: add final method

Rodrigo Muino Tomonari requested to merge github/fork/calvinmetcalf/streams-final into master

Adds the ability to for write streams to have an _final method which acts similarly to the _flush method that transform streams have but is called before the finish event is emitted and if asynchronous delays the stream from finishing. The final option may also be passed in order to set it.

this is a new version of #2314 as discussed at nodejs/readable-stream#275, cc @nodejs/streams

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
Affected core subsystem(s)

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