[issue15906] argparse add_argument() confusing behavior when type=str, default=

[R. David Murray]

R. David Murray added the comment:

To repeat: there is no change to be made for 3.3.  3.3.0 will go out the door with the pre-12776 behavior.  So any backward compatibility concerns that apply to 2.7 and 3.2 also apply to 3.3.  Thus I suggest we restore the string check, and consider an enhancement patch at more leisure for 3.4.

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<http://bugs.python.org/issue15906>
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