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Stickler
is someone who insists on following rules or doing things exactly the right way. They’re very particular and often won’t accept shortcuts or anything less than perfect.

Examples:
1- Alfred Hitchcock, the legendary filmmaker, was a stickler for suspense. He once delayed releasing a movie until every single detail was perfect—even the sound of footsteps in one scene.
2- Fashion designer Coco Chanel was a stickler for simplicity. She famously said, "Before you leave the house, look in the mirror and take one thing off.