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=== tests/cases/compiler/optionalParamTypeComparison.ts ===
var f: (s: string, n?: number) => void;
>f : (s: string, n?: number) => void
>s : string
>n : number
var g: (s: string, b?: boolean) => void;
>g : (s: string, b?: boolean) => void
>s : string
>b : boolean
f = g;
>f = g : (s: string, b?: boolean) => void
>f : (s: string, n?: number) => void
>g : (s: string, b?: boolean) => void
g = f;
>g = f : (s: string, n?: number) => void
>g : (s: string, b?: boolean) => void
>f : (s: string, n?: number) => void
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