Array.prototype.sort make compareFn required in lib.d.ts

This is a suggestion to change the signature declaration of Array sort in lib.d.ts from

sort(compareFn?: (a: T, b: T) => number): this;

to

sort(this: string[], compareFn?: (a: string, b: string) => number): this;
sort(compareFn: (a: T, b: T) => number): this;

i.e. make compareFn non-optional for non-string arrays. This would result in errors in cases such as

[2, 10].sort() // returns [10, 2], i.e. sorted lexicographically, which is very unintuitive.

While this is strictly speaking a breaking change, it wouldn't be the first time the typings are stricter than the actually definitions.

Leggi le dichiarazioni di Array.prototype.sort in lib.d.ts e confrontale con gli overload proposti. Il lavoro è completato quando gli array non di stringhe richiedono compareFn, mentre gli array di stringhe mantengono un compareFn opzionale; verifica l'esempio [2, 10].sort() rispetto al comportamento dei tipi risultante.