31/ And there's a whole section of patterns on how you work with legacy code.
One of the neat things about these patterns is that they're *totally compatible* with your existing code.
This was a surprise! It wasn't part of my original design goals.
But it turns out that Nullables and all the other patterns, except the optional architecture patterns, can coexist side-by-side with your existing sh^H^H lovingly handcrafted legacy code.
Like literally, even in the same test.