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mention potential performance impact

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Niko Matsakis 2022-10-11 11:38:16 -04:00
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@ -166,6 +166,8 @@ This RFC does not specify the validity invariant, instead delegating that decisi
It commits us to supporting upcasting, which can make "multi-trait" dyn more complex (see the Future Possibilities section).
Vtables become larger to accommodate upcasting, which could have an affect on performance.
# Rationale and alternatives
[rationale-and-alternatives]: #rationale-and-alternatives