圖像來源，Yakult Honsha
The integer 1 lands between "$bill" and "Zachery" because "1" sorts there lexicographically. Nothing in the function signature suggests this behaviour. That's the comprehension tax that parametricity eliminates—not just on the first reading, but every time we encounter code we haven't seen before. The same logic applies to any reader working under context constraints. The more we can infer from a type signature alone, the less we need to expand and read. Parametric types are a compact, verifiable representation of behaviour, which is useful whether the reader is a person doing code review or a tool with a limited window into our codebase.
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