Isiah Meadows wrote:
A polyfill could check if `A.p.sort` is stable, replacing if necessary, and
alias the old one to `A.p.fastSort` if it doesn't exist.
How does one check/test for the stability of a black-box sort? You
can't, afaik.
In my opinion, you'll never be able to rely on the stability of
`Array.prototype.sort` because of backward-compatibility with older
implementations where it is unstable.
As ugly as it might be, I'd recommend a separate
`Array.protytype.stableSort` (with an unambiguous name) therefore that
can be tested for existence and polyfilled in absence.
Or at least we'd need to tag the available implementations explicitly:
```js
Array.prototype.fastSort[Symbol.isStable] = false;
Array.prototype.stableSort[Symbol.isStable] = true;
Array.prototype.sort[Symbol.isStable] = /* to be chosen by implementer */;
```
which has the benefit that a test `if (…sort[Symbol.isStable])` will
yield a falsy default value (`undefined`) in legacy implementations.
Regards,
Bergi
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