> and the overhead on type checking for those is fairly minimal Well, yeah; the underlying C code assumes the type that was described to it by the wrapper (via

> and the overhead on type checking for those is fairly minimal Well, yeah; the underlying C code assumes the type that was described to it by the wrapper (via, generally, the .dtype of an array), so it's O(1). But I do wonder what the experience of Numpy has been like for the PyPy users.