Remove a redundant typing phase in the [refine] tactic.
Remove a redundant typing phase in the [refine] tactic.

The refined term is still typechecked twice (not counting Qed). But there seem to be a bug in the typechecker whereby it sometimes return terms which have universe inconsistencies. Until this is fixed, I'll leave the second typing phase which seems to catch these inconsistencies. To remove it, it suffices to change the [unsafe] flag to [true].
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