After #11861 is merged, the behavior of (1) will be consistent with (2), which I believe is the expected behavior. see playground

Ok (1) and (3) might be ok with the order of mount. I probably had a false perception how this works. But (1) still seems incorrect to me how setup is called. Like this It's for example not possible to use provide/inject properly.

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https://play.vuejs.org/#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