Commits on Apr 20, 2022

1. Add string[] to options defaultValue type …

   option and requiredOption's defaultValue parameter was `string |
   boolean` but the default for a variadic option should be an array.
   
   ```
   program.option('--var <args...>', 'variadic arguments', ['1'])
   program.parse([])
   > { var: ['1'] }
   
   program.parse(['--var', '1', '2'])
   > { var: ['1', '2'] }
   ```
   
   If you use a string default you have to handle opts that are strings
   ```
   // with a string arg the default value is a string.
   program.option('--var <args...>', 'variadic arguments', '1')
   program.parse([])
   > { var: '1' }
   
   program.parse(['--var', '1', '2'])
   > { var: ['1', '2'] }
   ```
   
   `unknown` matches the jsdoc comment and the typings for argument(name:
   string, description?: string, defaultValue?: unknown): this` but
   conflicts with other `option` overloads.
   
   commander will pass thru any defaultValue to parse opts so `any` or
   `unknown` are good choices, but `string | boolean | string[]` reflects
   the values that commander will return when it parses arguments without a
   coerce function.

   Caleb ツ Everett committed Apr 20, 2022
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