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  $hash_ref = CGI::Deurl::XS::parse_query_string($query_string)

Parses the given query string. If the string is empty, returns undef. Otherwise
returns a hash reference containing the key/value pairs encoded by the string.
Empty values are returned as undef. If a parameter appears only once, it's
value in the hash is the scalar value of the encoded parameter value. If a
parameter appears more than once, the hash value is an array reference
containing each value given (with value order preserved). Obviously, parameter
order is not preserved in the hash.

HTTP escapes (ASCII and Unicode) are decoded in both keys and values. The utf8
flag is not set on returned strings, nor are non-utf8 encodings decoded.

=back

=head1 EXPORT

None by default, parse_query_string at request.

=head1 SEE ALSO

L<CGI>