Expressions with null-Value: What should be returned null, "" or "null"

[predic8]

Input: { "a": null"}

template:
   src: { "foo":  ${fn.jsonpath('$.a') } }

At the moment "" is placed into the template. Here returning null makes sense.

But:

${header.foo}

Might cause problems.

[predic8]

@coderabbitai do u want to take part in the discussion?