I've written some introductory documentation for the NA-masked arrays. The patch is here:
https://github.com/m-paradox/numpy/commit/227e39c34b0e5d9dfde2bbce054b5a8ac088fd64 This is approaching the end of what I will implement for NA masks at the moment. I think the system is quite usable as is, though it is missing a number of major pieces like support for struct-NA, file I/O, and other things mentioned in the release notes. On the other hand, the C API for working with NA-masked arrays is solid and designed for future expansion to multi-NA, and many things can be done already with the implementation. It's also very stable and does not break ABI compatibility, so a NumPy release with NA masks in its current state should be perfectly reasonable. Cheers, Mark
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