Even though glob supports it, glob support for recursive ** searching is not enabled when specifying package_data. This is not clear in the documentation.

This means that only single * searches in a specific directory are supported. By changing the glob function to support recursive, this would allow us to specify ** patterns to a directory instead of having to specify every sub-directory in the structure.

Reference:
https://github.com/python/cpython/blob/master/Lib/glob.py#L18