googlefonts / googlefonts/fontmake
fvar should not be constructed from all .glyphs instances if a familyName customParam is defined
- Dominant language
- Python
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Description
In [Vollkorn](https://github.com/FAlthausen/Vollkorn-Typeface), there's a sibling SC family constructed in the following manner.

When I generate a variable font with `fontmake -g font.glyphs -o variable`, I get the following fvar table:
```
wght
400.0
400.0
900.0
256
```
When I delete the SC instances, I get the following correct table
```
wght
400.0
400.0
900.0
256
```
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