Negative indexing for Array is inconsistent

[dcabecinhas]

The negative indexing for sympy.Array seems to be broken.

In [1]: import numpy as np
   ...: import sympy as sp
   ...: 
   ...: a = np.array([[1,2],[3,4]])
   ...: b = sp.Array(a)
   ...: c = sp.Matrix(a)

In [2]: a[:,-1]
Out[2]: array([2, 4])

In [3]: b[:,-1]
Out[3]: [4  2]

In [4]: c[:,-1]
Out[4]: 
⎡2⎤
⎢ ⎥
⎣4⎦

The input b[:,-1] returns the reversed array [4 2] instead of the expected [2 4]. Using positive indexing for the last column returns the correct result

In [5]: b[:,1]
Out[5]: [2  4]