Where's 'goto definition' in 115.6? Follow

I see from the blog that ⌘B  now does 'goto implementation' by default. And this is the way it seems to work. But I have two puzzles:

1. how to I 'goto definition'? The menu item (Navigate->definition) for this no longer does anything
2. the keymap still shows ⌘B as being mapped to  goto definition, with ⌘⌥B mapped to goto implementation (ie. unchanged from previous builds. But the behaviour seems to be that both goto implementation.