Empty record merge returns undefined

[Methuselah96]

From @acrazing on Wed, 09 Sep 2020 07:34:10 GMT

For example:

import { Record } from 'immutable';

const emptyRecord = Record({})();

console.log(emptyRecord.merge({ id: 1 })); // -> undefined, expected result is emptyRecord

See CodeSandbox

Copied from original issue: immutable-js#1785

[Methuselah96]

Resolved in #23.