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Re:Show HN: Redbean – Single-file distributable web server by drran on Saturday February 27, 2021 @04:18PM (#26288267)
Multi OS/arch executables exists for decades. They were called fat-binaries[0]. Old trick is new again.

[0]: https://en.wikipedia.org/wiki/Fat_binary

https://en.wikipedia.org/wiki/Universal_binary

Re:Show HN: Redbean – Single-file distributable web server by Wowfunhappy on Saturday February 27, 2021 @10:26PM (#26290418)
But compared to what jart has done, those were effectively cheating. ;) They just smooshed multiple binaries into a single file.