On a related note to my previous post, Source Serif Pro now also comes with italics. Only came out 7 months ago but I’d completely missed that announcement. 4 years in the making. Still hasn’t been updated on Google fonts and doesn’t seem to have old style numerals - once you see numbers in this way, you can’t unsee them presented differently.
Update — I stand corrected. Source Serif Pro does have old style figures & ligatures. Frank also says he’s got an update coming soon for Google fonts.