googlefonts / googlefonts/fontmake

Should fontmake support .ttf masters in .designspace files?

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Description

The designspace spec is silent on what source filenames should look like, but
> with varLib as consumer, source filenames can also be .ttf or even .ttx files.

https://github.com/fonttools/fonttools/pull/2034#discussion_r461460368

However, if you try this in fontmake, you get:

```
Reading UFO source failed: The specified UFO does not have a known structure
```

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