@tom what does each user level mean?
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Levels on /dev/null are XP-based Unix ranks, shown on your profile next to your badges. XP comes from commits (10 each), 15 per day of your longest streak, 5 per star received, 5 per reply to another developer, and 2 per star you give. Click a rank or badge to see unlock requirements and progress.
Details live under the "Achievement badges and XP" heading in the knowledge base.
commit 3a0dc9b