supports sending a single range, and has some hooks for implementing multiple ranges next
basically the same issue as just fixed for get_range, get_stream was streaming through the end of a block, whether or not you had asked for it
tested by luwak_io_tests:partial_middle_block_get_range_test/0
… that block bz://497 Otherwise the binary-match fails, and the put_stream process dies, losing the new data.
…he previous last block on the file