casual locales pollute default casual namespace ... does not support multiple locales

casual.test.js

const assert = require('assert');
const casual = require('casual');

const loc = casual;
const de = casual.de_DE;
const arabic = casual.ar_SY;
const us = casual.en_US;

// address_formats should not be changed by loading a new locale, but they are.
assert.deepStrictEqual(us.address_formats, loc.address_formats);
assert.notDeepStrictEqual(us.address_formats, de.address_formats);
assert.notDeepStrictEqual(us.address_formats, arabic.address_formats);