change approach again

node_modules/moment/src/lib/duration/abs.js

@@ -0,0 +1,18 @@
+var mathAbs = Math.abs;
+
+export function abs () {
+    var data           = this._data;
+
+    this._milliseconds = mathAbs(this._milliseconds);
+    this._days         = mathAbs(this._days);
+    this._months       = mathAbs(this._months);
+
+    data.milliseconds  = mathAbs(data.milliseconds);
+    data.seconds       = mathAbs(data.seconds);
+    data.minutes       = mathAbs(data.minutes);
+    data.hours         = mathAbs(data.hours);
+    data.months        = mathAbs(data.months);
+    data.years         = mathAbs(data.years);
+
+    return this;
+}