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Correct kerning of numeral '1'

Hi all,

Any thoughts on the correct kerning of the lining numeral '1'? Specifically, correct kerning when a sans-serif face whose '1' is simply a stem (dangerously close to an uppercase 'I' or lowercase 'l').

The context would be when old style figures aren't available however proportional spacing would be desirable, such as in body copy.

Thanks