Ditto Processor for Drop Down Multiple?

Questions
1

I’ve got a drop down multiple that allows content editors to select multiple days of the week (e.g., “Monday” and “Tuesday”). If I do this:

[UmbracoProperty]
public IEnumerable<string> Days { get; set; }

The value doesn’t seem to get set because the result of [UmbracoProperty] is a string (e.g., “Monday,Tuesday”). Is there a built in processor to return a collection of strings for a drop down multiple?

This is a companion discussion topic for the original entry at https://our.umbraco.com/forum/87439-ditto-processor-for-drop-down-multiple