Inconsistent behavior with lz4 using tar (STDOUT)

[andretf]

tar -I lz4mt -cf tcc.tar.lz4 * is inconsistent with -l lz4. It's currently writing the content in the disk by its own as a default instead of passing to STDOUT when no output filename is provided. As a result I'm getting a file named "stdin" and an empty "tcc.tar.lz4". Forcing STDOUT with -c correct the behavior: