InputStream.transferTo() method should specify what the return value should be when the number of bytes transfered is larger than Long.MAX_VALUE

The javadoc of InputStream.transferTo only briefly states the expectations of the return value:

> @return the number of bytes transferred

It's possible that the inpustream instance could transfer more data than what can be returned as a long value.

It would help to have the API specify what the expectations are in such cases.