Interpolation problems in `OpenSans[wdth,wght].ttf`

Hello!

This is an automatically-generated report about possible interpolation problems in `OpenSans[wdth,wght].ttf`, as found in the Google Fonts catalog.

To download a PDF version of this report with helpful visuals of the problems, click [here](https://github.com/behdad/google-fonts-ofl-interpolatable-results/raw/0d437489ad1b554f348b29a8b42bdd37b59dc933/reports/OpenSans%5Bwdth%2Cwght%5D.ttf.pdf); Or to view it on the GitHub website, click [here](https://github.com/behdad/google-fonts-ofl-interpolatable-results/blob/0d437489ad1b554f348b29a8b42bdd37b59dc933/reports/OpenSans%5Bwdth%2Cwght%5D.ttf.pdf).

The report follows:
```
Glyph uni05D7 was not compatible:
Masters: '', 'wdth=75.0':
Contour 0 has a kink at 28: '', 'wdth=75.0'
Glyph uni05E4 was not compatible:
Masters: '', 'wdth=75.0':
Contour 0 has a kink at 32: '', 'wdth=75.0'
Glyph uni05E8 was not compatible:
Masters: '', 'wdth=75.0':
Contour 0 has a kink at 5: '', 'wdth=75.0'
```

This report was generated using the `fonttools varLib.interpolatable` tool. We understand that sometimes the tool generates false-positives. Particularly for more complicated font designs. If you did not find this report useful, please accept our apologies and ignore / close it.

To give feedback about this report, please file an issue or open a discussion at [fonttools](https://github.com/fonttools/fonttools).

Please note that I am doing this as a community service and do not represent Google Fonts.