Consider alternate J glyph for Noto Sans

[claysmalley]

From ZeLonewolf/openstreetmap-americana#965:

I never even noticed that Noto Sans gives the capital J a descender. I guess I can live with that, but do we have any way to exclude descenders from text measurements?

-- @1ec5

The ss04 feature tag gives Noto Sans a shorter J, but also a sans-serif I. Is it possible to freeze one glyph and not another?

[zekefarwell]

I'd think we'd also want a sans-serif I. It's a bit strange that Noto Sans(-serif) has serif I by default. All the other fonts we considered have a sans-serif I as you'd expect in a sans-serif font.

[1ec5]

For reference, major traffic sign typefaces have a sans-serif capital I, including:

• Highway Gothic 🇺🇸🇨🇦🇦🇺🇳🇿🇨🇳🇮🇳🇸🇬🇲🇴🇲🇾🇳🇱🇵🇭🇪🇸🇹🇼🇹🇭🇹🇷
• Clearview 🇺🇸🇨🇦🇧🇷🇮🇩🇮🇱🇵🇭🇱🇰
• DIN 🇩🇪🇨🇿🇱🇻🇿🇦🇸🇬🇧🇳🇸🇾🇻🇳
• Motorway 🇬🇧
• Transport 🇬🇧

One use case for a serif I would be the Roman numerals on India’s national expressways. However, we could simply swap out the ASCII letters in this conversion code for Roman numeral symbols. If a given font lacks serifs on those symbols, then I think that’s a strong justification for omitting the serifs.