Packed elements must be a power of two in size
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of elements. Packed types are used when multiple primitive data
are operated in parallel using a single instruction (SIMD).
A packed type requires a size (number of
-elements) and an underlying primitive data type. Packed types are
+elements) and an underlying primitive data type. Vectors must have a power
+of two length (1, 2, 4, 8, 16 ...). Packed types are
considered <a href="#t_firstclass">first class</a>.</p>
<h5>Syntax:</h5>