Trait Types for SciPy and NumPy

traittypes provides trait types extending the `traitlets` library, specifically designed for common data structures in the SciPy ecosystem, such as NumPy arrays and SciPy sparse matrices. It allows developers to define robust type-checked attributes for these data types in `traitlets`-based classes. The current version is 0.2.3. The library appears to be in maintenance mode, with no significant development since early 2021, meaning new features or bug fixes are infrequent.