[BUG] Elvis operator not working correctly (?:)

[ModProg]

Checklist before submitting an issue

• I have searched through the existing closed and open issues for eww and made sure this is not a duplicate
• I have specifically verified that this bug is not a common user error
• I am providing as much relevant information as I am able to in this bug report (Minimal config to reproduce the issue for example, if applicable)

Description of the bug

Elvis operator works on empty strings but not on null, i.e. "null"?:"hi" will result in null but ""?:"hi" will result in hi.

I also tested it with creating null by indexing an array ([][1]), to make sure it is not just that the string "null" is handled differently.

Reproducing the issue

(defwindow test
  :monitor 0
  (label :text {"[]"[1]?: "hi"}))

Expected behaviour

Should show hi but shows null

Additional context

I noticed that while implementing #622 in yuck.

[viandoxdev]

null and the string null are treated the exact same way by simplexpr IIRC, there is no json value only json operators

[ModProg]

null and the string null are treated the exact same way by simplexpr IIRC, there is no json value only json operators

Thought so too, just wanted to make sure.

[ModProg]

This was fixed since 0.4.0