Indentation rules overlap with ":" about cyber

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In both cases, the reason is for readability.

A colon after each block is a consistent pattern that indicates you are beginning a new block rather than continuing an expr on the next line. This is actually very important since Cyber is very structural in it's syntax.

"func" is preferred because it's not too short and not too long to convey what it is. Shorter doesn't automatically make something "better" or less wasteful. If the goal was to come up with the shortest acronym, this would be a different language. (Probably not a very well designed one)