ENH: Require h5py 2.10 for Windows + Python < 3.6

Author: effigies

nibabel/minc2.py

@@ -25,11 +25,21 @@
 
     mincstats my_funny.mnc
 """
+import sys
+import os
 import numpy as np
 
 from .keywordonly import kw_only_meth
 from .optpkg import optional_package
-h5py, have_h5py, setup_module = optional_package('h5py')
+
+# PY35: A bug affected Windows installations of h5py in Python3 versions <3.6
+# due to random dictionary ordering, causing float64 data arrays to sometimes be
+# loaded as longdouble (also 64 bit on Windows). This caused stochastic failures
+# to correctly handle data caches, and possibly other subtle bugs we never
+# caught. This was fixed in h5py 2.10.
+# Please see https://github.com/nipy/nibabel/issues/665 for details.
+min_h5py = '2.10' if os.name == 'nt' and (3,) <= sys.version_info < (3, 6) else None
+h5py, have_h5py, setup_module = optional_package('h5py', min_version=min_h5py)
 
 from .minc1 import Minc1File, MincHeader, Minc1Image, MincError