this looks like poor documentation (ambiguous), so I will just look at the source code or test what the return value is. And probably would raise issue or (if possible) fix the docs and make a pull request
If you can't explain it to a six year old, you don't understand it yourself, Albert Einstein
How to Ask Questions The Smart Way: link and another link
Create MCV example
Debug small programs
How to Ask Questions The Smart Way: link and another link
Create MCV example
Debug small programs