Vedran Čačić <ved...@gmail.com> added the comment:

If we want to proceed with this, much better way would be to add a rounding 
mode optional argument to `round` builtin.

But really, anyone trying to precisely round a decimal representation of a 
binary floating point number is, to paraphrase von Neumann, living in the state 
of sin. See https://stackoverflow.com/a/51146310/1875565.

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nosy: +veky

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<https://bugs.python.org/issue41598>
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