Error with GF.Elements() with dtype=object

[mhostetter]

As discovered in #185, calling GF.Elements() (or GF.Range()) on a "large" finite field, with dtype=object, results in an error. While GF.Elements() wouldn't want to be called on such a large field, GF.Range() might.

In [1]: import galois                                                                                                                        

In [2]: GF = galois.GF(2**100)                                                                                                               

In [3]: GF.Elements()                                                                                                                        
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-3-d052cf0ab5c9> in <module>
----> 1 GF.Elements()

~/repos/galois/galois/_fields/_array.py in Elements(cls, dtype)
    451             GF.display();
    452         """
--> 453         return cls.Range(0, cls.order, step=1, dtype=dtype)
    454 
    455     @classmethod

~/repos/galois/galois/_fields/_array.py in Range(cls, start, stop, step, dtype)
    365             array = np.array(range(start, stop, step), dtype=dtype)
    366 
--> 367         return array.view(cls)
    368 
    369     @classmethod

~/repos/galois/galois/_fields/_array.py in __array_finalize__(self, obj)
   1009             if obj.dtype not in type(self).dtypes:
   1010                 raise TypeError(f"{type(self).name} can only have integer dtypes {type(self).dtypes}, not {obj.dtype}.")
-> 1011             self._check_array_values(obj)
   1012 
   1013     def __getitem__(self, key):

~/repos/galois/galois/_fields/_array.py in _check_array_values(cls, array)
    252 
    253         # Check the value of the "field elements" and make sure they are valid
--> 254         if np.any(array < 0) or np.any(array >= cls.order):
    255             idxs = np.logical_or(array < 0, array >= cls.order)
    256             values = array if array.ndim == 0 else array[idxs]

TypeError: '<' not supported between instances of 'range' and 'int'

[mhostetter]

After #189, the above returns this, which is expected. It doesn't error where it did before. Instead, it complains that it doesn't have enough RAM, which it doesn't.

In [1]: import galois                                                                                                                                                                      

In [2]: GF = galois.GF(2**100)                                                                                                                                                             

In [3]: GF.Elements()                                                                                                                                                                      
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-3-d052cf0ab5c9> in <module>
----> 1 GF.Elements()

~/repos/galois/galois/_fields/_array.py in Elements(cls, dtype)
    446             GF.display();
    447         """
--> 448         return cls.Range(0, cls.order, step=1, dtype=dtype)
    449 
    450     @classmethod

~/repos/galois/galois/_fields/_array.py in Range(cls, start, stop, step, dtype)
    359             raise ValueError(f"The stopping value must be less than the field order of {cls.order}, not {stop}.")
    360         dtype = cls._get_dtype(dtype)
--> 361         array = np.arange(start, stop, step=step, dtype=dtype)
    362         return array.view(cls)
    363 

ValueError: Maximum allowed size exceeded