src: delete process.env values set to undefined
Before this commit, setting a property of process.env to undefined would set the value to the string "undefined". This changes the behavior to instead remove the value, working like the delete operator.
Refs: https://github.com/nodejs/node/pull/15089
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines
Affected core subsystem(s)
process