bug#26629: 25.1.50; Feature-request: Structure-preserving copying of sequences

[Lars Ingebrigtsen <larsi@gnus.org>]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

> So rather than `copy-tree*` I'd rather see some kind of generic
> `deep-copy` function which takes a (or some) parameter(s) that indicates
> when (and potentially how) to copy/recurse each of the elements (where
> `deep-copy`s job would thus be mainly to take care of maintaining the
> hash-map and maybe using an explicit stack to avoid deep recursion).

Makes sense to me.  Since we're not going to include `copy-tree*' (being
too niche), I'm closing this bug report, but a more general `deep-copy'
function would be welcome, if somebody were to write it.

-- 
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