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There seems little reason for the policy of throwing error if we find a ref to something other than a hash or array. Recursively look through the ref, instead. This makes the behavior in non-transform cases comparable to what was already instantiated for jsonb_plperl. Note that because we invoke any available transform function before considering the ref case, it's up to each transform function whether it wants to play along with this behavior or do something different. Because the previous behavior was just to throw a useless error, this seems unlikely to create any compatibility issues. Still, given the lack of field complaints so far, seems best not to back-patch. Discussion: https://postgr.es/m/28336.1528393969@sss.pgh.pa.us
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