No changes in the compiled binary representation, this just affects XML. After this change, the XML for empty ValueRecords is identical to the output from makeotf. https://github.com/behdad/fonttools/issues/471
https://github.com/behdad/fonttools/issues/471
See https://github.com/behdad/fonttools/issues/471 for the change to ValueRecords whose ValueFormat is zero; this may indicate a problem in otlLib that needs to be fixed. Resolves https://github.com/behdad/fonttools/issues/472.