z jin

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> I'm not sure about the comma syntax, it's basically a weird `and` that allows multiple definitions. I think single definition is enough in most cases. Both the comma syntax...

Sure. I close this PR for now and will reopen it when split is done.

> @zjin123 You created two separate commits, but @KoBeWi suggested to create two separate PRs. Thanks for the reminder. I just opened another PR https://github.com/godotengine/godot/pull/98538 for the first commit.

The reason of using comma here is that `and` or `&&` is not suitable with variable definition. Because when either `and` or `&&` is used directly after variable definition, they...