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Re:Apple Plans to Use Its Own Chips in Macs from 2020, Repla... by mtgx on Monday April 02, 2018 @02:50PM (#16737898)
I wouldn't know, but hasn't Apple made its Mac Store apps architecture-agnostic? I'd be surprised if that's still not the case.
Re:Apple Plans to Use Its Own Chips in Macs from 2020, Repla... by ken on Monday April 02, 2018 @03:03PM (#16738030)
No, the Xcode workflow is set up to make applications CPU-agnostic by default, but there's nothing about the Mac App Store that requires it. The executables are ordinary x64 binaries.

It'd be perfectly valid to write an application for the MAS in x64 assembly, if you want, as long as it's sandboxed and doesn't touch any private APIs.