gdal_array.SaveArray() leaves dataset open in Python

When I use gdal_array.SaveArray() to create a raster, the newly created dataset appears to stay open in Python, preventing other processes from working with it. For instance, consider the following (super minimal) code:

>>> a = np.arange(300).reshape((3, 10, 10))
>>> gdal_array.SaveArray(a, "test.tif")
<osgeo.gdal.Dataset; proxy of <Swig Object of type 'GDALDatasetShadow *' at 0x0458B968> >
>>> os.rename("test.tif", "test2.tif")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
WindowsError: [Error 32] The process cannot access the file because it is being used by another process

I am similarly prevented from moving, renaming, or deleting the file directly from Windows explorer, with the message The action can't be completed because the file is open in python.exe. More importantly, I can’t open the file some visualization/processing programs that I use. Once I exit python, the file is “released” and I can manipulate it to my heart’s content.

It doesn’t seem like the file has a name associated with it, so I can’t close it as I would a raster that I had specifically opened:

>>> dir()
['__builtins__', '__doc__', '__name__', '__package__', 'a', 'gdal', 'gdal_array', 'np', 'os']

What causes this behavior? Is there a way to call SaveArray() such that it doesn’t keep the file opened after writing it? Or, a way to close the file from within Python?

In case it’s important, my Python bindings are from gdal 1.11.1 for Python 2.7.8 on Windows 7.