function tryCatcher(err, val) {
	    try {
	        const target = tryCatchTarget;
	        tryCatchTarget = null;
	        return target.apply(this, arguments);
	    }
	    catch (e) {
	        exports.errorObj.e = e;
	        return exports.errorObj;
	    }
	}
Convert an array of multiple strings into a redis slot hash.
Returns -1 if one of the keys is not for the same slot as the others
@param keys
@returns {number}