Add a double-storey lowercase 'g' to Sans and Sans Display

[cssobral2013]

The font Open Sans
https://fonts.google.com/specimen/Open+Sans
has a double-storey 'g' whereas Noto Sans and Noto Sans Display don't, so it wouldn't be a bad idea to implement these. This's because Noto Sans and Open Sans are based off of the same font, Droid Sans.

[marekjez86]

@davelab6 : what do you think? don't need to reply now

[and-global]

It would be great to also have both available in Noto Sans CJK where only the double-story is available. Just posted an issue there: notofonts/noto-cjk#164

[nizarsq]

Look like only Notoserif has double-storey lowercase 'g'.

[simoncozens]

I'm not sure it makes sense to do this. We don't need to support all the different forms of letters in a single font. For other design choices, other fonts are available.

[moyogo]

I'm not sure it makes sense to do this. We don't need to support all the different forms of letters in a single font. For other design choices, other fonts are available.

The International Phonetic Alphabet used to distinguish ɡ U+0261 from the double-storey g U+0067, before the second one was replaced by ǥ (single-storey with stroke through descender) and then by the current ɣ. A couple of other transcription systems have used double-storey g and single-storey g with different meanings as well.

It would be useful in a few cases. However it’s hard to have a standard way of accesing it (any ssXX, any cvXX, maybe hist).