The Mantissa mathematical algorithms library project has announced the release of version 7.0. Rusty Elliot notes: "For many basic objects provided by Mantissa like Vector3D, Rotation, and the various Polynomial classes, instances are now guaranteed to be immutable. This greatly simplifies safe sharing of instances without forcing users to either put severe restrictions on their use of Mantissa classes or make numerous copies just to make sure everything is safe. Since the change is a semantic change on the contract of the classes, this version introduces some incompatibilities with respect to previous ones. Upgrading to this version is not difficult, though."
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