Type Literal instead of BigIntLiteral

[Tc14Hd]

The code

tree = ast.parse("1000000000000000n");
console.log(tree.body[0].expression);

outputs a node of type "Literal":

{
  type: 'Literal',
  value: 1000000000000000n,
  bigint: '1000000000000000'
}

But the README implies that the type should rather be "BigIntLiteral". Is this a bug?