Unexpected empty array returned on expression rather than NULL

[richardgaunt]

I just wanted to confirm / point out that I am receiving back a value from the below method that is different from the code comments:

\JmesPath\Env::search($expression, $data);

https://github.com/jmespath/jmespath.php/blob/master/src/Env.php#L25

The document block states that I should @return mixed Returns the matching data or null receive matching data or null but I have found that when I utilise this with object or list projection like:

included[?type=='paragraph--basic_text'] as long as the included array exists in the JSON, it will return an empty array rather than a NULL value.

Can I confirm that this is the expected behaviour?

Checking the tutorial website I get the same result in different versions of jmespath.

Thank you very much for the package. I am utilising it in integration testing to evaluate json responses which is incredibly useful.