Greyed out custom parameters?

What does it means when opening a UFO and getting greyed out custom parameters - what does the grey signify?

(From v2: Regular quick diff · Issue #9 · googlefonts/robotoslab · GitHub)

Usually that the Property is not recognised as a parameter.

Try leaving out the prefixes, e.g. strikeoutPosition instead of openTypeOS2StrikeoutPosition.

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Perfect, thanks!

I tried this and the parameters remain greyed out, are they still not recognized? or is something else affecting its appearance?

Not all of these are supported, I guess. Not on my Mac now, will send you an updated list of all parameters tomorrow.