* Merge given entities into given map. * * @param {object} source * @param {array} entities * @return {object}

* Convert value to currency's subunit (e.g. cents for USD). * Subunit is the minimal currency unit and it is always whole integer.

* Remove value by given key. * * @param {object} source * @param {string} key * @return {object}

* Set given entity in map. * * @param {object} source * @param {striobjectng} entity