A map of alias characters to their full names. Once set, we can use the alias characters in the arguments, and they will be converted to their full names in the result object after parsing.

Argument names that should be treated as lists. When an argument is in this list, the result object will store its values in an array.

By default, the parseArgs function will automatically convert the argument value to a number or boolean if it looks like one. If we don't want this behavior for some arguments, we can set this option to true, or an array of argument names that should not be coerced.