🚀 go-pugleaf

>and you can also store core dumps in Mach-O!

COFF's replacement in S5R4, ELF, also allows this.

>Mach-O is more universal, it allows you to assign start values to
>registers (does this work in COFF as well? -  I dunno.) 

Neither COFF nor ELF, as I remember, have this, although one way to
assign start values to registers is to stick code to do so at the start
address - is the ability to have "exec*()" or its moral equivalent load
arbitrary values to registers useful enough that this feature is worth
having?

>So if COFF isn't that compatible anyway, why not start from scratch
>and have a clean start? 

AT&T appears to agree, hence ELF....