Type error with solution to 04-generics-advanced/19-generic-interfaces-with-functions solution

[seemaullal]

The solution here https://github.com/total-typescript/typescript-generics-workshop/blob/main/src/04-generics-advanced/19-generic-interfaces-with-functions.solution.ts gives a Typescript error even though it passes all the tests:

Changing https://github.com/total-typescript/typescript-generics-workshop/blob/main/src/04-generics-advanced/19-generic-interfaces-with-functions.solution.ts#L8 to

clone: <U>(transform: (elem: T | undefined) => U) => Cache<U>;

seems to fix the issue

[seemaullal]

Someone pointed out that this is only an issue if noUncheckedIndexedAccess is turned on and it might be off in this repo by default (though I think I am using a slightly different TSConfig and noUncheckedIndexedAccess is on partially due to the suggestion of https://www.totaltypescript.com/tips/make-accessing-objects-safer-by-enabling-nouncheckedindexedaccess-in-tsconfig)