This PR removes the `nullable: boolean` and `list: boolean | boolean[]` API and replaces it with top-level type wrappers named: `list()`, `nonNull()` and `nullable()`
BREAKING CHANGES:
- `isTypeOf` is now the _default_ strategy to discriminate members of an abstract type. To keep using `resolveType` as you might have been before, enable the following config in `makeSchema`:
```ts
makeSchema({
features: {
abstractTypeStrategies: {
resolveType: true
}
}
})
```
One internal type error was raised with 3.9 that wasn't before.
This might have led to end-users having to enable skipLibCheck?
For the uncertainty, treating this as a feature as opposed to a chore.
Tim Griesser
Flavian Desverne
Jason Kuhrt
Jason Kuhrt