Is there an existing issue for this?

• I have searched the existing issues for a bug report that matches the one I want to file, without success.

Problem Description

The documentation for RationalField's round method says

        Return the nearest integer to ``self``, rounding away from 0 by
        default, for consistency with the builtin Python round.

Yet the builtin Python round currently (since Python3 I think) rounds to nearest, with halfway case rounding to even. The first example in the documentation is (9/2).round() which yields 5, and consequently in Sage round(9/2) yields 5 as well; whereas in Python the same round(9/2) yields 4.

Proposed Solution

A simple solution may be to change the default to even, which is the current Python convention and is already implemented in this method round for rational field.

Alternatives Considered

Or, seemingly less ideal: one could keep the current behaviour and modify the documentation to highlight that this diverges from Python's builtin behaviour.

Additional Information

No response