Allow processing square buffers. #1150

Job	Run time
Lint C++	30s
Pre-build on ubuntu-20.04 with clang	1m 33s
Lint Python (3.12, ubuntu-20.04)	9s
Pre-build on macos-13 with clang	1m 47s
Pre-build on ubuntu-20.04 with gcc	59s
Build wheel for ${{ matrix.build }}	0s
Test ${{ matrix.runner_index }} / ${{ matrix.runner_total }} with Python ${{ matrix.python-version }} on ${{ matrix.os }}	0s
Test with Python 3.7 + Address Sanitizer	7m 27s
Test with Python 3.8 + Address Sanitizer	8m 0s
Test with Python 3.9 + Address Sanitizer	7m 59s
Test with Python 3.10 + Address Sanitizer	7m 58s
Test with Python 3.11 + Address Sanitizer	7m 47s
Test with Python ${{ matrix.python-version }} on ${{ matrix.os }}	0s
Upload wheels to PyPI	0s
	44m 9s

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