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Developer`PackedArrayQ
 PackedArrayQ[expr] returns True if expr is a packed array in its internal representation, and returns False otherwise.
PackedArrayQ[expr, type] returns True if expr is a packed array of objects of the specified type.
PackedArrayQ[expr, type, rank] returns True if expr is a packed array of the specified rank.
Supported types are Integer, Real and Complex.
See also: ToPackedArray, ByteCount.
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