This patch release adjusts the isPlainObject util to allow objects created via Object.create(null), and fixes a type issue which accidentally made the store state type non-nullable.

What's Changed

• fix(isPlainObject): support check Object.create(null) by @zhe-he in #4633
• fix(types/store): Unexpectedly narrowed return type of function Store['getState'] by @exuanbo in #4638

Full Changelog: v5.0.0...v5.0.1