If you ignore "words" of several digits entirely that precludes finding errors in things like phone numbers, addresses and other numerical data in a more casual manner (I expect professional docs would have additional oversight to make sure numerical data is correct). In this case I'm thinking more of a mask comparison: there are 27 uses of 12345 and 01 uses of 12346, is this correct? In this way the potential outlier is obvious.
As for single in-word digits, while not particularly common, you may experience difficulty with sci-fi stories including leetspeak. This may also affect things like program names (ex: Win8).
Granted, these are more likely to be edge cases than mainstream edits, but I thought I would mention them for consideration.
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