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Do a type check for result types like
(or (vector t 5) (vector t 10))
in MAP. Tries to avoid doing the type check for simple type specifiers like VECTOR or specialized array classes.CMUCL has the same bug we do in MAP and this is basically how SBCL fixed it. Maybe not ideal, but I think it is probably the easiest fix without changing the plumbing in MAKE-SEQUENCE significantly.