DerefMut should be for Sized?
#19520
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lnicola
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Apr 28, 2025
Align usage of `default` and `new` with style guide
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Right now,
DerefMutis notfor Sized?, so you can't implDerefMut<T> for FoowhereFoois unsized. However, there is no reason that it can't befor Sized?, so this pull request fixes the issue.Closes #19493.