Daily Godot Tip #38: You can select text and hit shift f4, shift f5, or shift f6 to swap the letter cases. They swap it to all uppercase letters, all lowercase letters, and capitalized respectively

It looks like it treats anything that’s already capitalized and the beginning of a number as a new word and inserts a space before. So in practice it might not mess up the code too much, but I’m not sure why it doesn’t behave more similarly to the others.