unexpected breaking changes with `process.exitCode`/`process.exit()`

### Version 20.0.0-pre (nightly) ### Platform Darwin dib.lan 22.1.0 Darwin Kernel Version 22.1.0: Sun Oct 9 20:14:30 PDT 2022; root:xnu-8792.41.9~2/RELEASE_ARM64_T8103 arm64 ### Subsystem process ### What steps will reproduce the bug? ```js const assert = require('assert') process.exitCode = 2 delete process.exitCode // REMOVE assert(process.exitCode === undefined) // REMOVE process.exit(undefined) ``` ### How often does it reproduce? Is there a required condition? reproduces on all node versions built after landing #44711 ### What is the expected behavior? the assertion should pass, and if the two lines marked `REMOVE` are commented out the process should exit with code `2` ### What do you see instead? the assertion throws, and if the two lines marked `REMOVE` are commented out the process exits with code `0` ### Additional information _No response_