Thenable isn't cancelable anymore

[AndyOGo]

Calling .then() on a CancelablePromise returns a Promise, which can't be canceled anymore.

Problem is here:

p-cancelable/index.js

Lines 73 to 75 in cdec148

	then(onFulfilled, onRejected) {
	return this.#promise.then(onFulfilled, onRejected);
	}

[AndyOGo]

Alternativly cancelable-promise does it correctly.

https://github.com/alkemics/CancelablePromise/blob/98665b2d38da2d3c28fb15ff22bb5e4d910c723f/src/CancelablePromise.ts#L38-L59

[idoodler]

The issue with cancelable-promise is that canceling a promise won't reject it