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Those are not duplicate -- several features really was added twice to two different bugfix releases.

For features with multiple versionadded's, would it help to specify what was added in that version? To me the docs look slightly confusing currently.

When it says "New in version X" under the description of a class, function etc., it means that that thing was introduced in that version and wasn't present in the previous versions. So for these examples, these were not present in 3.5.3 or 3.6.0.

Maybe it helps you understand to know that "minor" versions (3.5, 3.6 etc.) are descendents/ancestors of each other, but "bugfix" versions (3.5.4, 3.6.1 etc.) are descendants of the previous bugfix version? E.g. 3.6.1 is a descendant of 3.6.0, i.e. 3.6.

Thank you for the detailed explanation.