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At line 237 of string.py:
 def convert_field(self, value, conversion):
 # do any conversion on the resulting object
 if conversion == 'r':
 return repr(value)
 elif conversion == 's':
 return str(value)
 elif conversion is None:
 return value
add
 elif conversion == 'a':
 return ascii(value)
The alternatives should be ordered by decreasing frequency. I suspect that should be None, 's', 'r', 'a'.