> Feature #15560: Add support for read/write offsets.
> https://bugs.ruby-lang.org/issues/15560

Fwiw, Perl5 has had these features since forever and they're
immensely useful for non-blocking I/O.

> Could also include "size:" so that we can selectively write parts of the buffer.

Yes, perl's syswrite and IO::Handle->write has this, too.

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