moment.duration.days returns radically different result than asDays

[gamecubate]

There's something I'm not getting. Either that or it's a bug. Tested with latest (2.14.1) version in Chrome 51.0.2704.103 on iOS 10.11.5.

var now = moment(),
      later = moment("20161023", "YYYYMMDD"),
      diff_ms = later.diff(now),
      dur = moment.duration(diff_ms, "ms");

console.log(dur.days());    // 11
console.log(dur.asDays());  // 72.06...

[mj1856]

.asDays() returns the total duration, in units of whole and fractional days.

.days() returns the number of days that are remaining after accounting for .years() and .months().