Issue with Free Tensor example

[lingyiyang]

On the website (https://www.roughpy.org/user/fundamentals.free_tensors.html), we have the following example

data = [
    {1: 1., 2: 2.},
    {0: 1., 2: 1.}
    ]
tensor5 = FreeTensor(data, width=2, depth=2)

This is currently broken and returns the following error:
ValueError: maximum nested depth reached in this context at lineno 582 in /project/roughpy/src/scalars/scalars.cpp in function void compute_size_and_type_recurse(rpy::python::PyToBufferOptions&, std::vector<pybind11::object>&, const pybind11::handle&, rpy::python::GroundDataType&, rpy::dimn_t)

I am not sure what this example is doing/illustrating and therefore also do not understand the error I am getting. Fixing the issue and some additional documentation would be appreciated.