Overloaded custom operators in Python are broken

[borisfom]

Is overload supported in Python?
When I try doing something like :

@onnx_op(op_type="CustomAdd", inputs=[PyOp.dt_float], outputs =[PyOp.dt_float])
def custom_add_float32(x, y):
    return np.add(x, y)

@onnx_op(op_type="CustomAdd", inputs=[PyOp.dt_float16], outputs=[PyOp.dt_float16])
def custom_add_float16(x, y):
    return np.add(x, y)

I am getting errors:

terminate called after throwing an instance of 'std::runtime_error'
  what():  Type float16 not supported by python customops api