"Can't define a variable scalar in a non-variable font"

My build fails with that error message, trying to generate static instances.

Is this a variable scalar?:
`pos a' b <0 (wght=100:0 wght=400:50 wght=1000:100) 0 0>;`

If so, I feel like this should get resolved for generating statics in the same way that outline interpolation gets resolved, which should ultimately be the same calculation.

Or am I getting something wrong?

Is it the norm today to cut statics via varLib.instancer and I just ignore making statics the old way?

Start by reproducing the static-instance build failure with the provided variable scalar expression. Compare how static generation handles this expression with how outline interpolation is resolved, and check whether varLib.instancer is the intended path. Done means the expected static instances can be generated or the supported workflow is documented.

Written by the indexing model from the issue text.