Ruud H.G. van Tol wrote about cloning blocks:
Often, the copy-message is delivered in that {}-block,
otherwise you would end up with 2 copies (actually 1 original
and 1 copy) delivered to the same place.
(Which happens to everybody, now and then.)
Sometimes intentionally: I had a situation where I wanted the clone to
survive the nesting block [during which it had been filtered] and to be
processed, alongside the original, by the remaining recipes in the rcfile.
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