Add a `NodeMut::leaves_mut`?

[hasezoey]

orx-tree 1.10.0

I have noticed there exists ::walk(_mut) and ::walk(_mut)_with, but there only exists ::leaves and ::leaves_with, but no ::leaves_mut or ::leaves_mut_with which are, at least from a user standpoint, just a filter over ::walk (which is not quite possible as Over*Node is not OverMut).
Or did i miss something?

Maybe #149 is related?

[orxfun]

No, you're all correct. leaves_mut seems to be a missing implementation, I am checking.