Ensure arrays passed to MutableArrayData have same type (#5091) #5092
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Which issue does this PR close?
Closes #5091
Rationale for this change
Not validating this can cause unsound behaviour, as the invariants of the various array data structures are not maintained.
Fortunately most kernels already validate this, but MutableArrayData should have this sanity check to avoid potentially unsound behaviour.
What changes are included in this PR?
Are there any user-facing changes?