What happened to "glyphs Containing Component With Name_masterID_"

Glyphs
1

What has this been renamed to?

    glyphsContainingComponentWithName = Font.glyphsContainingComponentWithName_masterID_(l.parent.name, l.associatedMasterId)
AttributeError: 'NSKVONotifying_GSFont' object has no attribute 'glyphsContainingComponentWithName_masterID_'
2

The ID in masterID is masterId, now.