Incorrect constructor parameter types for class `PostgresError`

According to the types, to construct a new PostgresError the first argument is a message string:

With this code:

import postgres from "postgres";

const error = new postgres.PostgresError("Error message.");

console.log(Object.entries(error));

What actually logs is:

[
  [ '0', 'E' ],
  [ '1', 'r' ],
  [ '2', 'r' ],
  [ '3', 'o' ],
  [ '4', 'r' ],
  [ '5', ' ' ],
  [ '6', 'm' ],
  [ '7', 'e' ],
  [ '8', 's' ],
  [ '9', 's' ],
  [ '10', 'a' ],
  [ '11', 'g' ],
  [ '12', 'e' ],
  [ '13', '.' ],
  [ 'name', 'PostgresError' ]
]

That's because actually the first argument it seems is supposed to be an Error instance:

https://github.com/porsager/postgres/blob/0428b30937400a7dadc8ed09587c44ef917052a6/src/errors.js#L1-L7

Start with src/errors.js at the constructor referenced in the issue, then compare its accepted argument with the published constructor types. Confirm the mismatch using the example from the report and make the runtime behavior and declared parameter types agree; existing checks should pass afterward.