Back in the day, PG allowed ":" as a generic operator name, making
this even worse; but I think the only remaining SQL syntax that could
include a colon is array slicing.

Ok, so the behavior of replacing ":unknown" by same cannot be changed.

Some fun:

  \set 1 1
  SELECT ('{1,2,3,4,5,6,7,8,9,10,11,12}'::INT[])[1:1];
  -- yields 11


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