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child_process: ignore undef/proto values of env

Rodrigo Muino Tomonari requested to merge github/fork/Gerhut/master into master

At present, undefined values of env option will be transferred as an "undefined" string value and values in the prototype will also be included, which are not usual behaviors.

Since non-string env values & prototype values are undocumented, this change may be treated as a bugfix or a breaking change.

Tested on Mac, Windows not yet.

Fixes: https://github.com/nodejs/node/issues/15087

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)

child_process

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