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05c8e1d85d
… it performs a deep copy internally
fixes #25324
notes that
> Enabling `-d:nimPreviewSlimSystem` removes the import of
`channels_builtin` in
in the `system` module, which is replaced by
[threading/channels](https://github.com/nim-lang/threading/blob/master/threading/channels.nim).
(cherry picked from commit 5d4829415a)