<itemvalue="If [onError] is not given, and this future completes with an error, the error is forwarded directly to the returned future."/>
<itemvalue="If `eagerError` is true, the returned future completes with an error immediately on the first error from one of the futures. Otherwise all futures must complete before the returned future is completed (still with the first error; the remaining errors are silently dropped)."/>
<itemvalue="eager Error"/>
<itemvalue="A method returns a human readable string representing a file _size"/>
<itemvalue="[size] can be passed as number or as string the optional parameter [round] specifies the number of digits after commapoint (default is 2)"/>