message: fix(case): check for args to be defined
diff: @@ -29,6 +29,7 @@ export class Case<T, K extends PropertyKey = never>
  constructor(args: ConstructorArgs<T, K>) {
  this.#args = args
  + if (typeof args === "object" && args != null) {
  const keys = Object.keys(args)
  for (let i = 0; i < keys.length; i++) {
  @@ -42,7 +43,7 @@ export class Case<T, K extends PropertyKey = never>
  enumerable: true
  })
  }
  -
  + }
  this.#keys = Object.keys(this).sort()
  }
  