I'm afraid that one always needs to check smart quotes. Mostly they are ok. But there is no algorithm that will always get the direction right when they occur immediately after a dash. Nor for space followed by an inverted commma ('tis, ''cos, 'em).
So I always to a manual check.
This can take very little time with some books. But 'the Ragged Trousered Philanthropists' took hours because of all the colloquialisms.
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