static <A> A assertEqualsOptionalVerbose(bool verbose, O x, A y) {
  ret assertEqualsOptionalVerbose(verbose, null, x, y);
}

static <A> A assertEqualsOptionalVerbose(bool verbose, S msg, O x, A y) {
  ret verbose ? assertEqualsVerbose(msg, x, y) : assertEquals(msg, x, y);
}