#40 Provide character variation for old style numeral 1

[Pander]

For the old style numerals, please provide a character variant in which the numeral 1 does not look like I (Roman numeral 1).

See for example how this is implemented for https://github.com/georgd/EB-Garamond

Via fontspec in XeLaTeX one can enable that by \addfontfeature{CharacterVariant=11:1} in case of EB Garamond.

[ienissei]

I would also love to see this feature implemented in a future release. This variant on the ‘1’ character would be extremely useful for legal documents in which a ‘I’ looking number is not acceptable.