function wrapper( value, aidx, sidx, arr ) {
		return clbk.call( thisArg, value, aidx, arr );
	}
Invokes a provided callback.

@private
@param {*} value - current element
@param {NonNegativeInteger} aidx - current array index
@param {NonNegativeInteger} sidx - current strided index
@param {Collection} arr - input array
@returns {number} callback return value