Arange with constant outputs does not result into a type with constant shape

[ferrine]

Describe the issue:

pt.arange allocates a vector of length that depends on input values but the output shape has dynamic type

Reproducable code example:

assert pt.arange(10).type.shape == (10, )

Error message:

(None, ) != (10,)

PyTensor version information:

'2.16.1'

Context for the issue:

used here https://github.com/pymc-labs/pymc-marketing/blob/main/pymc_marketing/mmm/transformers.py#L102C50-L102C59

[ricardoV94]

This is not a bug it's missing functionality. None is compatible with 10, and eager static shape inference has a cost