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sebmarkbage
0c4e650f61
While we want to get rid of React.lazy's special wrapper type and just
use a Promise for the type, we still have the wrapper.
However, this is still conceptually the same as a Usable in that it
should be have the same if you `use(promise)` or render a Promise as a
child or type position.
This PR makes it behave like a `use()` when we unwrap them. We could
move to a model where it actually reaches the internal of the Lazy's
Promise when it unwraps but for now I leave the lazy API signature
intact by just catching the Promise and then "use()" that.
This lets us align on the semantics with `use()` such as the suspense
yield optimization. It also lets us warn or fork based on legacy
throw-a-Promise behavior where as `React.lazy` is not deprecated.
DiffTrain build for [9be531cd37](https://github.com/facebook/react/commit/9be531cd37f5558c72f7de360eb921b0074e8544)