yes
and the space is substituted by the thin space

And I guess deleting the space after the "½" kicks in makes it go to "11/2"? Is being forced to have a space between the "1" and "½" an acceptable compromise?

hhp

I reckon you could hack it to accept other spaces and nonjoiners and replace them with your own choice of space or nonjoiner.

I've come across another problem with this method that I'm not sure how to fix.

Fractions aren't created if I'm using Oldstyle figures.

How can I include Oldstyle figures in the code?

Fractions aren't created if I'm using Oldstyle figures.

How can I include Oldstyle figures in the code?

Put the frac feature before the onum feature.

And I guess deleting the space after the "½" kicks in makes it go to "11/2"? Is being forced to have a space between the "1" and "½" an acceptable compromise?

Deleting the space before the "½" makes it into "11/2", I think is what you meant. Which of course would cause "one-and-one-half" to be incorrectly read as "eleven-halves." But in plain text, you'd almost always have a space (or something) between the "1" and the "1/2" for precisely that reason. Tal noted the pros and cons in his [Bad link], and the "space" compromise is mentioned in both categories.

Yes, before, sorry.

So this code never involves virgule or nut fractions?
http://typophile.com/files/Pseudo-nut-fraction_5178.png

hhp

I experimented with nut fractions when I was making Scotch Modern, but couldn’t get them to work in the Fraction feature in both InD and Quark, so just implemented the basic fractions as pre-composed.

However, I have since thought of a better way to do nut fractions in the feature—but haven’t had cause to implement it, as all my subsequent faces have had “slash” fractions, not nut.