Created attachment 140961 [details]
Suggestion Bahnschrift code U+006C
In the DejaVu Sans fonts (except Mono), the upper i (U+0049) glyph is too similar to the lower l (U+006C).
They are confusing.
For example in French, a good proportion of sentences start by "Il" ("He" in French). When displayed by DejaVu Sans fonts, they seem to start with two vertical lines (similar to U+007C by the way). Additionaly you can easily confuse them with the Roman number 2 at first sight. That makes reading harder and slower.
In English, a good test is this name: "Illinois". Discussion: https://www.reddit.com/r/Windows10/comments/6vpv8w/microsofts_new_bahnschrift_font_vs_segoe/
1. Add serifs to the upper i (U+0049)
You can note that the Verdana font does that, although it is a Sans Serif font.
2. Why not style a bit the lower l (U+006C) to not be a pure vertical line any more, and avoid confusion with U+007C ?
A good example is in the (Sans Serif) font Bahnschrift code U+006C.
DejaVu Sans Condensed
DejaVu Sans Light