Allow stable sorting to be turned off

[josevalim]

Also verify if we should expose the multithreaded option during sorting or not.

[kimjoaoun]

Are there any downsides in exposing the multithreaded option?

[philss]

Are there downsides in exposing the multithreaded option?

@kimjoaoun I don't think so. I think we can have both options. If you want to take this one, please go ahead!

[kimjoaoun]

Are there downsides in exposing the multithreaded option?

@kimjoaoun I don't think so. I think we can have both options. If you want to take this one, please go ahead!

Nice, I'll take it.

[billylanchantin]

Closed by: #771

@kimjoaoun Sorry! I didn't see that you'd called dibs on this.

[billylanchantin]

@josevalim Oh I may have jumped the gun on this one. Can you confirm that #771 closed this?

[josevalim]

It is all good!

[kimjoaoun]

Closed by: #771

@kimjoaoun Sorry! I didn't see that you'd called dibs on this.

No problem at all!