Gael puts in a plea for backward compatibility;  I totally agree.

Numpy sometimes goes out of its way to make this hard.  For example, when the 
syntax of histogram were changed you got a nice DepreciationWarning about an 
option to switch to the new behaviour; great.  But a few releases later that 
option went away and code carefully written to survive the transition stopped 
working;  that didn't make me a happy user.

                                        R

> Also, putting more emphasis on backward compatibility is possible. For 
> instance, the 'order' parameter added to np.copy could have defaulted to the 
> old behavior, 'K', for a year, with a DeprecationWarning, same thing for the 
> casting rules.

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