Commits on Jan 16, 2022

1. Allow readonly arrays to be used as choices …

   Consider following usage:
   
   ```ts
   const SupportedDrinks = ['small', 'medium', 'large'] as const;
   type Drink = typeof SupportedDrinks[number];
   
   const program = new Command()
         .addOption(new Option('-d, --drink <size>', 'drink size').choices(SupportedDrinks))
   ```
   
   This allows user to get a strongly typed enum and reuse it to automatically populate supported drinks. 
   This code doesn't compile now though since readonly array is not assignable to just `string[]`.

   

   Pzixel committed Jan 16, 2022
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