numpy/numpy — pull request #183 by charris (2012-01-14 22:26:06+00:00)
Title: Fix na astype

Fix for ticket #1973.

The fix is to make ndarray.astype method propagate the maskna flag. Another option would be adding a maskna keyword to the method to allow choosing the output type, with a 'None' value as default, meaning to propagate the maskna flag.