`done` doesn't return connection about node-pg-pool HOT 1 CLOSED

'use strict';

const pg = require('pg');

const databasePool = new pg.Pool({
	/* Other connection params here */
	max: 2,
});

let requested = 0;
let retrieved = 0;
let returned = 0;
for (let i = 0; i < 5; i++) {
	requested += 1;
	console.log(`Requested ${i} (${requested}/${retrieved}/${returned})`);
	databasePool.connect((err, client, done) => {
		retrieved += 1;
		console.log(`Retrieved ${i} (${requested}/${retrieved}/${returned})`);
		if (err) {
			returned += 1;
			done(err);
			// client.release();
			console.log(`Returned ${i} (${requested}/${retrieved}/${returned})`);

			return console.log(err);
		}

		client.query('select pg_sleep(1)', [], (err) => {
			returned += 1;
			done();
			// client.release();
			console.log(`Returned ${i} (${requested}/${retrieved}/${returned})`);
			if (err) {
				console.log(err);
			}
		});
	});
}