BigInt/int64 number format not working

[guilhermecgs]

Describe the bug
BigInt not working. In the example below, maximum is converted to number format, losing its precision.

operationTypeCode:
  type: integer
  format: int64
  minimum: -2147483648
  maximum:  9223372036854775800
  example: 42

Expected behavior
When receiving this parameter in the javascript, the type should be BigInt

module.exports = (prop) => {
    return [{ message: Type ${typeof prop.maximum}}];
}
Type = BigInt

Additional context
Already tested with   maximum:  9223372036854775800n (n at final). It does not work either