Frame.from_parquet`` and ``Frame.from_arrow`` now accept a ``dtypes`` argument.
All ``PathLike`` path objects now accepted wherever ``Path`` objects were previously.
Added ``fillna`` methods to ``Index``, ``IndexHierarchy``.
Added to ``StoreFilter`` the following parameters: ``value_format_float_positional``, ``value_format_float_scientific``, ``value_format_complex_positional``, ``value_format_complex_scientific``.
``Index`` and ``IndexHierarchy`` will reuse instances for set operations on equivalent indices.
Added ``IndexHierarchy.from_names`` constructor for creating zero-length ``IndexHierarchy``.
Refinements to ``IndexHierarchy`` to support grow-only mutation from zero length.