Describe the issue: When creating a NumPy array from a list of lists with dtype=object, NumPy implicitly promotes inner lists to ndarray if their lengths are uniform, but keeps them as list if not.

About An interactive 3D Rubik's Cube solver for AeroHack'25 with a Python/Flask backend and JS frontend. It uses the Kociemba Two-Phase algorithm and pre-computed pruning tables to find and visualize ...