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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