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grammar My-Grammar {
    token TOP       { \s* <object> \s* }
...
               | true    | false     | null 
    }
}

my $source-string = q/{
  "firstName": "John",
...
my $match = My-Grammar.parse($source-string);
say ~$match if $match;
# say $match.made if $match;

{
  "firstName": "John",
...
  },
  "spouse": null
}

class My-actions {
    method TOP($/) {
...
        }  
    }
}

{"address" => {
    "streetAddress": "21 2nd Street",
...
    "state": "NY",
    "postalCode": "10021-3100"
  }, "age" => 25, "firstName" => "John", "isAlive" => True, "lastName"
+ => "Smith", "spouse" => (Any)}

            default { make ~$/;}