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Gorgious56 251157f8d4 Fix np_frombuffer_legacy length-vs-dtype check

The check `len(bytedata) == n * 2` was wrong: float64 is 8 bytes per
element, not 2. Legacy float64 checksums fell through to the float32
reader and produced a (2n,)-shaped array, breaking is_moved() and
is_camera_moved() with `ValueError: operands could not be broadcast`
on .blend files saved by Blender <5.0.

Adds a parametrized regression test covering both n=3 (translation)
and n=9 (rotation) for both dtypes.

Generated with the assistance of an AI coding tool.

2026-06-10 17:37:41 +02:00