Native C-level 2D grid/table flattening in _pickle / array

Hi python-ideas, I’m working on LibrePy / WriterAgent, a FOSS project bringing native scientific Python (=PY()) and NumPy into LibreOffice. Because of binary compatibility constraints in the runtime, the host environment assumes only standard Python and must offload heavy calculations to an isolated worker process running NumPy from a specified venv. While optimizing data transfer between the host and worker, I ran into a performance bottleneck in how Python serializes 2D grid/table data, and ...