This returns an error for trying to update or insert into invalid columns, without hitting the database. This change also switches from `json_populate_recordset` for these operations `json_to_recordset` which should make no functional difference except allowing future flexibility.
BREAKING CHANGE
Not gzipping the output more than doubles the throughput for a simple "do nothing" RPC function.
Postgrest's gzip support was surprisingly slow, lacked in configurability, was undocumented and untested.
It was possible to achieve this before by not sending `Accept-Encoding: gzip`, but that turned into a bit of an undocumented gotcha. Most browsers do send it and by default a proxy pass would forward this header. Better to not support gzip at all, further focusing on ensuring Postgrest is a minimal layer over Postgres.
Nginx, or whatever proxy, provides critical options such as min length, vary headers and so forth, and will likely have much better performance as well.
