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This PR preserves correlations between constant array variants during array unpacking instead of collapsing them into a single shape with optional keys.
It handles string-key overwrites, integer-key renumbering, optional offsets, and combinations of explicit and unpacked elements.
Precise expansion is limited to 32 combinations, with the existing approximation retained as a fallback for larger products.
The new behavior is guarded by the
preciseArrayShapeUnpackingbleeding-edge feature toggle.Regression tests cover both precise and approximated inference.