The release notes for SU2018 states:
Fixed Geom::Transformation.scale(float) and Geom::Transformation.new(float) to not set the 15th component of the matrix, but instead adjust the other fields.
It should say:
Fixed Geom::Transformation.scaling(float) and Geom::Transformation.new(float) to not set the 15th component of the matrix, but instead adjust the other fields.
“scaling”, not “scale” is the name of the method in the Ruby API.