docs: public static MutableBoolean fromExternal(final BooleanSupplier s, final Consumer<Boolean> c) {
          return new MutableBoolean() {
              @Override
              public boolean getAsBoolean() {
                  return s.getAsBoolean();
              }
  
              @Override
              public Boolean get() {
                  return getAsBoolean();
              }
  
              @Override
              public MutableBoolean set(final boolean value) {
                  c.accept(value);
                  return this;
              }
          };
      }