* Fixed segfault in repr when running under Python 3
2.5.4
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* Added `DefaultStruct` in the spirit of the standard library `defaultdict`. Also added a `to_default_struct` for recursively converting dicts recursively.
2.5.3
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* Fix use-after-free when repring a `Struct` that contains itself more than once.
2.5.2
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* Fix make and tox targets for build and release. * Fix lint issues.