Serhiy Storchaka added the comment:

I have decided to not merge these changes in 3.5. They help to avoid 
programmatic errors, but have a non-zero chance of breaking programs that work 
by accidence. Since this is the last non-secure bugfix we will not have a 
chance to rollback these changes.

An alternative to these changes is testing a program with Python 3.6.

versions:  -Python 3.5

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