Replaced the last attempt at an "unreadline" with one that actually works on non-seekable file-like objects, such as URLs.  (Oops.)
Replaced the last attempt at an "unreadline" with one that actually
works on non-seekable file-like objects, such as URLs.  (Oops.)

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