Some loaded fonts don’t load instance menu, due to FontKit namedVariations

[arrowtype]

This isn’t happening in every font, or maybe not even most fonts. It could be an issue with the fonts themselves. However, I want to track it so I can maybe figure it out. The main error from the extension console is:

popup.js:2 Failure to load named instances: TypeError: Cannot read properties of undefined (reading 'en')
    at get namedVariations (831.bundle.js:2:441259)
    at r.get (831.bundle.js:2:209402)
    at o.<anonymous> (popup.js:2:34628)
    at popup.js:2:31681
    at Object.next (popup.js:2:31786)
    at i (popup.js:2:30433)

It seems it may boil down to this:
foliojs/fontkit#272

Looking at the fonts where this does and doesn’t work, it does some that:

• If the default instance in fvar points to a nameID above 255, the instance menu loads. Examples: Open Sans, Shantell Sans, AT Name Sans
• If the default instance in fvar points to a nameID that is not represented above 255, such as a "Regular" fvar default that points to nameID 2 or 17, the error occurs. Examples: AT Kyrios, AT Lang, AT Name Mono.

Looks like it could potentially be fixed with foliojs/fontkit#324, but that PR is still open.

[simoncozens]

Yes, this is what I was getting in latest fontkit. Let's just depend on the fixed branch!