I ran into a couple bugs in scalartypes.inc.src: - The switch statement in PyArray_ScalarAsCtype was missing some breaks. - When SIZEOF_LONGDOUBLE == SIZEOF_DOUBLE, PREC_REPR and PREC_STR should both be 17, not 15. (This matches what's done in floatobject.c for Python's float.) The attached patch (against SVN revision 2045) fixes both problems. Cheers, Chris