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Date: Sat, 26 Jan 2019 20:52:51 +0000
From: Eric Wong <normalperson@yhbt.net>
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Subject: [ruby-core:91290] Re: [Ruby trunk Feature#15560] Add support for
 read/write offsets.
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> 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.