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4ef06a5cc5
It speeds up ```nim proc foo = let piece = cast[seq[char]](newSeqUninit[uint8](5220600386'i64)) foo() ``` Notes that `cast[ref](...)` is excluded because we need to keep the ref alive if the parameter is something with pointer types (e.g. `cast[ref](pointer)`or `cast[ref](makePointer(...))`) --------- Co-authored-by: Andreas Rumpf <rumpf_a@web.de>