Sort Stability — The Concept That Separates Good from Great

Here's a secret from interviewers: most candidates have no idea what sort stability means, or why it matters. The ones who can say 'I'm relying on stable sort here — Python guarantees it' while coding get marked significantly higher on the communication rubric. It's a specific, technically precise statement that demonstrates depth. Let me explain why stability matters and how to use it deliberately. Stability in Practice When Stability Actually Matters in DE Pipelines