Louie Lu added the comment:

I'm not sure the "safer" meaning. If it is about for beginner less confuse when 
mistakenly typing "d[long_<tab>", the answer will be yes for only complete 
string keys.

Impl complexity between str-only and not-str-only will not have too much 
different, only need to change the sentinel and some other work.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue21261>
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