This is a Swift version of Llewellyn Falco's Patterns: Many of One

• In Method
  • Convert single value to array of 1 value
  • Convert into loop over that array of 1 value
  • Add second value to array
  • Convert everything
• APIs preserving backwards compatibility
  • Arrays
    • Change parameter from 1 number to a variadic function
    • Alternatively, add a second method overload that takes an array
  • Objects
    • Add Options argument with default value