1) The overflow detection in mpd_qln() has a surprising number of case splits.    List all of them in the comment.
1) The overflow detection in mpd_qln() has a surprising number of case splits.
   List all of them in the comment.

2) Use the recently stated relative error of _mpd_qln() to generate the
   interval for the exact value of ln(x). See also the comment in mpd_qexp().

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