CEA projection: plotting all the data works, plotting part of the data fails.

Using the following setup, Python 2.7/matplotlib 1.2.1/basemap 1.0.6

from mpl_toolkits import basemap

m1 = basemap.Basemap(projection='cea', lon_0=0)
lon = [-135, -45, 45, 135]
lat = [45, 45, 45, 45]

If I then run the following command, the line plots as expected:

m1.plot(lon, lat, latlon=True)

But plotting just the first two points alone gives a failure:

m1.plot(lon[:2], lat[:2], latlon=True)

Here's the result:

---------------------------------------------------------------------------
IndexError                                Traceback (most recent call last)
<ipython-input-273-c6f75eb64ab8> in <module>()
      8 lat = [45, 45, 45, 45]
      9 #m1.plot(lon, lat, latlon=True)
---> 10 m1.plot(lon[:2], lat[:2], latlon=True)

/Users/jakevdp/anaconda/python.app/Contents/lib/python2.7/site-packages/mpl_toolkits/basemap/__init__.pyc in with_transform(self, x, y, *args, **kwargs)
    525             if self.projection in _cylproj or self.projection in _pseudocyl:
    526                 if x.ndim == 1:
--> 527                     x = self.shiftdata(x)
    528                 elif x.ndim == 0:
    529                     if x > 180:

/Users/jakevdp/anaconda/python.app/Contents/lib/python2.7/site-packages/mpl_toolkits/basemap/__init__.pyc in shiftdata(self, lonsin, datain, lon_0)
   4700             londiff = np.abs(lonsin[0:-1]-lonsin[1:])
   4701             londiff_sort = np.sort(londiff)
-> 4702             thresh = 360.-londiff_sort[-2]
   4703             itemindex = len(lonsin)-np.where(londiff>=thresh)[0]
   4704             if itemindex:

IndexError: index -2 is out of bounds for axis 0 with size 1

Edit: here's an error from a similar call, but I believe it's unrelated to the first:

lat = [-45, 45, 45, 45, 45, 0]
lon = [135, -135, -45, 45, 135, -90]
m1.plot(lon, lat, latlon=True)

error:

---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-295-d815d338a0b6> in <module>()
     11 lon = [135, -135, -45, 45, 135, -90]
     12 
---> 13 m1.plot(lon, lat, latlon=True)
     14 

/Users/jakevdp/anaconda/python.app/Contents/lib/python2.7/site-packages/mpl_toolkits/basemap/__init__.pyc in with_transform(self, x, y, *args, **kwargs)
    525             if self.projection in _cylproj or self.projection in _pseudocyl:
    526                 if x.ndim == 1:
--> 527                     x = self.shiftdata(x)
    528                 elif x.ndim == 0:
    529                     if x > 180:

/Users/jakevdp/anaconda/python.app/Contents/lib/python2.7/site-packages/mpl_toolkits/basemap/__init__.pyc in shiftdata(self, lonsin, datain, lon_0)
   4702             thresh = 360.-londiff_sort[-2]
   4703             itemindex = len(lonsin)-np.where(londiff>=thresh)[0]
-> 4704             if itemindex:
   4705                 # check to see if cyclic (wraparound) point included
   4706                 # if so, remove it.

ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()

Reproduce the two examples with the Python 2.7, matplotlib 1.2.1, and Basemap 1.0.6 setup, then inspect mpl_toolkits/basemap/init.py around the m1.plot transform and shiftdata entry points shown in the traceback. Done means plotting the two-point subset succeeds and the related multi-point example no longer raises the reported indexing or truth-value errors.