What's new in h5py 3.4

New features

The pre-built wheels now bundle HDF5 1.12.1 (1945).
len() now works on dset.astype(), .asstr() and .fields() wrappers (1913).

Fix bug introduced in version 3.3 that did not allow the creation of files using the flag "a" for certain drivers (e.g. mpiio, core and stdio) (1922).
Dataset indexing will now use the optimized fast path, which was accidentally disabled in a previous version (1944).
Fix an error building with Cython 3.0 alpha 8 (cpdef inside functions) (1923).