I'm glad Microsoft uses Bash in the example, instead of their own Windows shells. As a user I would like having something like "Git Bash" for Windows built in the system, as default shell.
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Not sure what you mean by “default shell”. The default shell on Windows is this: https://en.wikipedia.org/wiki/Windows_shell. I don’t suppose you mean booting into Bash. Windows doesn’t have any other notion of a default shell.