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Ah, the sacred art of variable naming. When your brain sees userId, it reads "user ID." But when it sees userid, your inner voice screams "USER-id???" like some confused database goblin.
This is the hill many senior devs choose to die on after years of staring at poorly named variables. We'll spend 15 minutes in code review arguing about capitalization but somehow let that 500-line function with no comments slide right through.
