make vcat of SparseVectors with different el- and/or ind-type yield SparseVector (#22225) #22301
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Fixes the first part of #22225. Best!
(Probably should be backported alongside #22299: #22299 fixes the second part of #22225, but makes the bug in the first part of #22225 worse (wrong result type -> stack overflow). This pull request fixes the stack overflow.)