I have noticed a few issues with the "rational" custom C dtype example.
1. It doesn't build on Windows. I managed to tweak it to build. Mainly, the MSVC9 compiler is C89. 2. A few tests don't pass on Windows, due to integer sizes. 3. The copyswap and copyswapn routines don't do in-place swapping if src == NULL, as specified in the docs. http://docs.scipy.org/doc/numpy-1.10.0/reference/c-api.types-and-structures.html --Steve
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