User:CubScout302/sandbox

-- These always return true: yesno('yes') yesno('y') yesno('true') yesno('t') yesno('1') yesno(1) yesno(true)

-- These always return false: yesno('no') yesno('n') yesno('false') yesno('f') yesno('0') yesno(0) yesno(false)

-- A nil value always returns nil: yesno(nil)