in src/js/object-mona-parser/object-parser-common.js [183:191]
function hashWithoutKeys(hash, keys) {
const newHash = {};
for (var hashKey in hash) {
if (hash.hasOwnProperty(hashKey) && keys[hashKey] === undefined) {
newHash[hashKey] = hash[hashKey];
}
}
return newHash;
}