mweststrate / immer / 684

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feat: passing drafts to produce

Improve support for nested producers by allowing drafts to be passed
as or in the base state.

DETAILS:

- Added `state.scope` for knowing when a draft is owned by the current
  producer or not.

- Objects included in the return value of a nested producer are
  never auto-freezed, because they may contain drafts from a parent producer.

- Drafts are always finalized by the producer that created them.

- Now that `state.base` can be a draft, we must ensure `state.finalized`
  is false before creating drafts in the `get` handler. This only affects ES2015+ proxies.

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