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... and rename it and its sibling array_offsets to array_position and array_positions, to account for the changed behavior. Having the functions return subscripts better matches existing practice, and is better suited to using the result value as a subscript into the array directly. For one-based arrays, the new definition is identical to what was originally committed. (We use the term "subscript" in the documentation, which is what we use whenever we talk about arrays; but the functions themselves are named using the word "position" to match the standard-defined POSITION() functions.) Author: Pavel Stěhule Behavioral problem noted by Dean Rasheed.