Don't call len() if the value is already cached!  Caught by Gerrit Holl <gerrit.holl@pobox.com>.
Don't call len() if the value is already cached!  Caught by Gerrit
Holl <gerrit.holl@pobox.com>.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator