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We would like to move towards an arena system for JSON encoding the responses. This change pushes an "out" parameter into the pg-test to json routines to make swapping in an arena system easier in the future. (see #11992) This additionally removes the redundant `column: &[Type]` argument, as well as rewriting the pg_array parser. --- I rewrote the pg_array parser since while making these changes I found it hard to reason about. I went back to the specification and rewrote it from scratch. There's 4 separate routines: 1. pg_array_parse - checks for any prelude (multidimensional array ranges) 2. pg_array_parse_inner - only deals with the arrays themselves 3. pg_array_parse_item - parses a single item from the array, this might be quoted, unquoted, or another nested array. 4. pg_array_parse_quoted - parses a quoted string, following the relevant string escaping rules.