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builtins.toJSON {
  a = 123;
  b = -456;
  c = "foo";
  d = "foo\n\"bar\"";
  e = true;
  f = false;
  g = [ 1 2 3 ];
  h = [ "a" [ "b" { "foo\nbar" = {}; } ] ];
  i = 1 + 2;
  j = 1.44;
  k = { __toString = self: self.a; a = "foo"; };
}