Do very many people actually draw (or correct) their TTFs in quadratics? Don’t most folks just learn to avoid constructions that don’t convert well, convert at time of compilation, cross their fingers, and let it go?
(Unless you’re specifically working on specialized screen fonts, perhaps.)
When a glyph is a component of a component, vfb2ufo tends to remap it to the original component when converting.
For example, if you have a periodcentered.uc which is a shifted component of periodcentered, and periodcentered is itself a shifted component of period, then upon conversion, the periodcentered.uc will become a component of period (with the coordinates correspondingly recalculated).
I don’t know why it does this. It isn’t the end of the world, and functionally it is the same (and it’s possible that when it comes time for compilation this same remapping needs to happen anyway; I haven’t investigated). But it can be a nuisance, especially if you aren’t aware of the idiosyncrasy.
As another example, imagine that Einstein’s famous equation E=mc² is
text in an all-italic sidebar. In this typical situation, doesn’t it
make more sense for the = symbol to be slanted? Because this is just as
likely a usage of = in an italic setting as pure maths, if not more so.
Here’s a real-world example of such a non-technical setting. (Okay, so it’s not an all-italic sidebar, but same basic idea, I think.)
From TIME magazine, Nov. 2, 2015:
Call me old-fashioned, but I just don’t see anything wrong with the unslanted symbol.