Christian Heimes <li...@cheimes.de> added the comment:

IMHO it's not obvious to all users. Better safe than sorry. ;)

The invariant 'known and equal length' impresses an artificial limitation. Code 
may need to compare outside data with internal data without exposing too many 
details about the structure of the internal data.

The other matter should be discussed at #14955.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue15061>
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