Strikeout values are not written to font
I noticed that the values in
RFont.info.openTypeOS2StrikeoutPositionare not written into a generated OTF. Instead, the
openTypeOS2StrikeoutSizeis always the same as the
openTypeOS2StrikeoutPositionis set to the x-height * 0.6, it looks like some kind of FDK fallback is taking place there.
ufo2fdk adds those value correctly into the source .otf before sending it to fdk