Option to "commit" the sorted key order

[CarlosNZ]

Currently, when the "keySort" prop is enabled, the data is displayed alphabetically by key, or by a compareFunction.

However, this is just for display and doesn't change the underlying data. It might be useful to have a commitSort option that actually modifies the data object according to the sort rules.

Keen to get some input as to what would be useful/expected in this regard.