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Seems like overstepping bounds. I expect a language runtime to make use of system provided facilities wherever feasible. I also expect it to provide hooks for me to link in alternatives.

If nothing else doing otherwise is likely to cause compatibility issues for someone at some point. For example see all the problems Go had with DIY syscalls pretty much everywhere except for Linux.

There's a legitimate question of whether the kernel ABI or the libc API qualifies as the system provided facilities on a linux box. But that uncertainty only furthers my latter point about compatibility.