Suggestion

It would be pretty useful to add syntax in which you can flip a boolean.
The expression would be: (!|flipped )%boolean%
It could also be used as an effect: flip %boolean%

Example: set player's fly state to !player's fly state

Why?

This feature would greatly help some people & help with compressing some scripts!
I personally made this in my own addon and it helped compress some scripts.

Other

It's based off the Java syntax, in which you can for example do if (!message.exists) { return null; } (if message does not exist, return null)

I'm not sure if this exists in skript-reflect but either way it would be pretty useful.

Agreement

• I have read the guidelines above and affirm I am following them with this suggestion.

Handled in a more Skript-friendly way in #4154

Duplicate of #5386, we also have not ...