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The compile-time versus runtime privacy debate ends here. Learn when TypeScript's `private` modifier wins, when ECMAScript `#` fields dominate, and how to choose the right pattern for your production codebase.

Learn how TypeScript's NoInfer<T> utility type prevents unwanted type inference in generic functions, solving parameter widening and default value problems that break type safety.

Most runtime key collision bugs stem from string keys treated as unique when they are not. TypeScript's symbol and unique symbol types provide compile-time guarantees that prevent accidental interchangeability and eliminate an entire class of identity errors.