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I was going to suggest using a mono-space font, but I see Jellby already did that.
I use Monaco, which uses a slashed zero, and wonderfully differentiates between upper-case I, lower-case l, and number 1. It falls down on em-dash though, they are very slightly longer than the hyphen/en-dash and hard to tell apart, so before proofing I temporarily replace all the em-dashes with a unique character, such as @ or #.
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