Support for the Ruby 2.4 series has ended. See here for reference.
Object
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Returns a hash, that will be turned into a JSON object and represent this object.
 
               # File json/lib/json/add/symbol.rb, line 9
def as_json(*)
  {
    JSON.create_id => self.class.name,
    's'            => to_s,
  }
end