Why getBounds().getSouthWest() sometimes returns bottom-right coordinates instead of bottom-left coordinates?

I get the boundaries of my visible map like this:
var bounds = map.map.getBounds();
var southWest = bounds.getSouthWest();
var northEast = bounds.getNorthEast();

var minLat = southWest.lat();
var maxLat = northEast.lat();
var minLong = southWest.lng();
var maxLong = northEast.lng();

Most of the time this works fine. bounds.getSouthWest() returns the
bottom-left coordinates and bounds.getNorthEast() returns the top-
right coordinates.

But when I cross the longitude of 180 (the point where 180 degrees
turns into -180 degrees), I start getting weird results for the
boundaries. To me it seems that bounds.getSouthWest() returns the
bottom-RIGHT coordinates and bounds.getNorthEast() returns top-LEFT
coordinates.

Here is a picture where this has happened:
http://google-maps-api.googlegroups.com/web/screenshot.png?gsc=bOT3FAsAAAD4-eP2_Nc0eBwShbtUNUUj

In the pic you can see that bounds.getSouthWest().lng() returns a
positive value although it should return a negative value.
And bounds.getNorthEast().lng() returns a negative value although it
should return a positive value.

How can I be sure to always get the bottom-left coordinates of the map?

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