Delaney, Timothy (Tim) wrote:
> Plus copy-on-write isn't something you want in general - it's *much*
> slower since it needs to copy the internal data every time it's
> modified. The vast majority of uses of data structures does not involve
> concurrent modification.

But copy-on-write in the presence of reference counts doesn't do the
mad useless-copy stuff.

--Scott David Daniels
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