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Question:
What is the point of the
 old_encoding = codecs.lookup(self._encoding).name
 encoding = codecs.lookup(encoding).name
 if encoding == old_encoding and errors == self._errors:
 # no change
 return
dance? Isn't this equivalent to
 if encoding == self.encoding and errors == self._errors:
 # no change
 return
except that it doesn't validate the given encoding? But if the encoding is invalid, isn't it enough that the exception is raised a few lines further down?