Just about every time I set up a new `Context.Provider`, I end up accidentally specifying a `values` prop rather than `value`.  While it's a minor error, generally I build the container in which the provider resides and commit it to the code base before I ever use it.  It's only later when I go to use it that I realize I did it again.  Since the `Context.Provider` seems pretty much useless without a `value` prop specified, I'd love it if there was a prop error if it is missing... especially if another prop is defined on the `Context.Provider` instead.
span('Bar: 1'),
        ]);
        
        ReactNoop.render(<App foo={2} bar={2} />);
        expect(Scheduler).toFlushAndYield(['Bar']);
        expect(ReactNoop.getChildren()).toEqual([
          span('Foo: 2'),
          span('Bar: 2'),
        ]);
        
        ReactNoop.render(<App foo={3} bar={3} />);
        expect(Scheduler).toFlushAndYield(['Foo', 'Bar']);
        expect(ReactNoop.getChildren()).toEqual([
          span('Foo: 3'),
          span('Bar: 3'),
        ]);
      });
      it('can skip parents with bitmask bailout while updating their children', () => {
        const Context = React.createContext({foo: 0, bar: 0}, (a, b) => {
          let result = 0;
          if (a.foo !== b.foo) {
            result |= 0b01;
          }
          if (a.bar !== b.bar) {
            result |= 0b10;
          }
          return result;
        });
        const Consumer = getConsumer(Context);
        function Provider(props) {