Waiting for 9.1 – Arrays in PL/Perl

On 18th of February, Alvaro Herrera committed patch:

Convert Postgres arrays to Perl arrays on PL/perl input arguments
More generally, arrays are turned in Perl array references, and row and
composite types are turned into Perl hash references.  This is done
recursively, in a way that's natural to every Perl programmer.
To avoid a backwards compatibility hit, the string representation of
each structure is also available if the function requests it.
Authors: Alexey Klyukin and Alex Hunsaker.
Some code cleanups by me.

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