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=== tests/cases/compiler/callbackArgsDifferByOptionality.ts ===
function x3(callback: (x?: 'hi') => number);
>x3 : { (callback: (x?: 'hi') => number): any; (callback: (x: string) => number): any; }
>callback : (x?: 'hi') => number
>x : "hi"
function x3(callback: (x: string) => number);
>x3 : { (callback: (x?: "hi") => number): any; (callback: (x: string) => number): any; }
>callback : (x: string) => number
>x : string
function x3(callback: (x: any) => number) {
>x3 : { (callback: (x?: "hi") => number): any; (callback: (x: string) => number): any; }
>callback : (x: any) => number
>x : any
cb();
>cb() : any
>cb : any
}
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