np.load fails because np.frombuffer is None

Using PyPy 2.3 installed via pyenv, np.load fails when trying to read data because it makes use of np.frombuffer which is None. Setting np.frombuffer equal to np.fromstring is a workaround.

Numpy instaled via pip install git+https://bitbucket.org/pypy/numpy.git.

Output of python --version:

$ python --version                                   
Python 2.7.6 (394146e9bb67, May 08 2014, 17:08:54)   
[PyPy 2.3.0 with GCC 4.6.3]

IPython log:

# IPython log file

get_ipython().magic(u'pinfo %save')
get_ipython().magic(u'quickref')
get_ipython().magic(u'pinfo %logstart')
import numpy as np
np.load('tests/lena.npz').keys()
#[Out]# ['lena']
np.load('tests/lena.npz')['lena']
repr(np.frombuffer)
#[Out]# 'None'
np.frombuffer = np.fromstring
np.load('tests/lena.npz')['lena']
#[Out]# array([[ 0.63529414,  0.63529414,  0.63529414, ...,  0.66666669,
#[Out]#          0.60784316,  0.50196081],
#[Out]#        [ 0.63529414,  0.63529414,  0.63529414, ...,  0.66666669,
#[Out]#          0.60784316,  0.50196081],
#[Out]#        [ 0.63529414,  0.63529414,  0.63529414, ...,  0.66666669,
#[Out]#          0.60784316,  0.50196081],
#[Out]#        ..., 
#[Out]#        [ 0.16862746,  0.16862746,  0.19607843, ...,  0.40784314,
#[Out]#          0.39215687,  0.38431373],
#[Out]#        [ 0.17254902,  0.17254902,  0.21568628, ...,  0.40784314,
#[Out]#          0.41176471,  0.42352942],
#[Out]#        [ 0.17254902,  0.17254902,  0.21568628, ...,  0.40784314,
#[Out]#          0.41176471,  0.42352942]], dtype=float32)
get_ipython().magic(u'logstop')

Exception and traceback:

---------------------------------------------------------------------------                        
TypeError                                 Traceback (most recent call last)                        
<ipython-input-5-95e5d6d28212> in <module>()                                                       
----> 1 np.load('tests/lena.npz')['lena']                                                          

/users/rjw57/projects/dtcwt/venv-pypy/site-packages/numpy/lib/npyio.pyc in __getitem__(self, key)  
    248             if magic == format.MAGIC_PREFIX:                                               
    249                 bytes = self.zip.open(key)                                                 
--> 250                 return format.read_array(bytes)                                            
    251             else:                                                                          
    252                 return self.zip.read(key)                                                  

/users/rjw57/projects/dtcwt/venv-pypy/site-packages/numpy/lib/format.pyc in read_array(fp)         
    466                 data = _read_bytes(fp, read_size, "array data")                            
    467                 array[i:i+read_count] = numpy.frombuffer(data, dtype=dtype,                
--> 468                                                          count=read_count)                 
    469                                                                                            
    470         if fortran_order:                                                                  

TypeError: 'NoneType' object is not callable

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