sS lambdaArgsToString_pureJava(S[] args) {
  ret l(args) == 1 ? first(args)
    : roundBracketed(joinWithComma(args));
}

sS lambdaArgsToString_pureJava(LS args) {
  ret lambdaArgsToString_pureJava(toStringArray(args));
}