This is a regression from ufoLib v2.1.1, see https://github.com/adobe-type-tools/afdko/pull/462#issuecomment-403577134 https://travis-ci.org/adobe-type-tools/afdko/jobs/401751859#L8427
This is a regression from ufoLib v2.1.1, see https://github.com/adobe-type-tools/afdko/pull/462#issuecomment-403577134 https://travis-ci.org/adobe-type-tools/afdko/jobs/401751859#L8427