From: Eric Wong <normalperson@...>
Date: 2018-05-18T18:52:13+00:00
Subject: [ruby-core:87176] Re: [Ruby trunk Bug#14745] High memory usage when using String#replace with IO.copy_stream

Good to know the destination buffer to #update helped :>

> But I can imagine `String#exchange!` being a useful tool for
> diligent string management.

Maybe... As it stands, destination buffers for #read and #update
are underutilized and I'm glad to see them being used more.
Thus I'm not hopeful of #exchange! being widely adopted...
When used, destination buffers would still offer better performance,
anyways, as there's no extra object slot used.

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