std: rename .connect/.concat in VectorVector to avoid conflicting with StrVector.
This is caused by StrVector having a generic implementation for &[S] and so #5898 means that method resolution of ~[~[1]].concat() sees that both StrVector and VectorVector have methods that (superficially) match. They are now connect_vec and concat_vec, which means that they can actually be called.
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