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util: use a global symbol for `util.promisify.custom`

Rodrigo Muino Tomonari requested to merge github/fork/ExE-Boss/lib/util/use-global-util-promisify-custom-symbol into master

Define util.promisify.custom as:

Symbol.for("nodejs.util.inspect.custom")

rather than as:

Symbol("util.inspect.custom")

This allows custom promisify wrappers to easily/safely be defined in non‑Node.js environments and for non‑Node promisify implementations to be interoperable.

Fixes: https://github.com/nodejs/node/issues/31647

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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