select knob options object keys are strings or numbers only
select knob options object keys are strings or numbers only

* select knob uses the keys of the "options" object as the selected values, and doesn't support arbitrary types as values. 
* It only supports arbitrary types for the select->option->child. These are the values in options object. 
* The value of the select knob or the selected option however, is still either a string or number. Also, since typescript object key signature can only be either "string" or "number" (but not string | number) we need to specify both types explicitly. 
options : { [s: string | number]: T } does not work.
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