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Václav Šmilauer authored
1. Make python return Vector2r, Vector2r, Vector3i, Vector3r, Quaternionr and Matrix3r by reference rather than by value; fixes http://www.mail-archive.com/yade-dev@lists.launchpad.net/msg03406.html and was introduced by fixing https://bugs.launchpad.net/yade/+bug/539562. See explanation in Serializable.hpp.
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