A register is a CRDT that holds a single value. There are a couple kinds of registers, but the simplest is the Last Write Wins Register (or LWW Register).
you and the PythonLabs team started at BeOpen, I think.
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Each of those is a ghost commit. Behind each message is an AI that turned words into working code, and a session ID that ties the output back to the generation.
The puzzle set contains several tasks in Bubble Notation with gradually increasing difficulty.