static HashMap<Set<S>, Class> loadFunctions_cache = new HashMap;
static Lock loadFunctions_cached_lock = lock();

sbool loadFunctions_preferDiskCache; // Note: This may use outdated versions of standard functions

static Class loadFunctions_cached(S... functions) {
  ret loadFunctions_cached(asList(functions));
}

static Class loadFunctions_cached(Collection<S> functions) {
  TreeSet<S> functionSet = new TreeSet<S>(functions);
  lock loadFunctions_cached_lock;
  Class c = loadFunctions_cache.get(functionSet);
  if (c != null) ret c;
  S cached = getTranspiledStandardFunctionsIfCached(functionSet);
  S transpilation = null;
  if (cached != null && (loadFunctions_preferDiskCache || standardFunctionsCacheUpToDate(functionSet))
    transpilation = cached;
  if (transpilation != null) {
    // TODO: LIBS
    print("Loading " + joinWithPlus(functionSet));
    c = veryQuickJava_finish(transpilation, emptyList());
  }
  
  if (c == null) c = loadFunctions(functionSet);
  
  loadFunctions_cache.put(functionSet, c);
  assertNotNull(loadFunctions_cache.get(functionSet));
  ret c;
}