Commits on Sep 23, 2020

1. Fix Typescript 4.1 compile error …

   Typescript 4.1 will have [stricter rules for type predicates](microsoft/TypeScript#39258) like
   
   ```ts
   export const isObject = (val: unknown): val is Record<any, any> =>
     val !== null && typeof val === 'object'
   ```
   
   As a result of these rules, an expression in collectionHandlers.ts in
   the reactivity package doesn't get narrowed to the type it did in TS 4.0
   and below. Instead it gets an intersection type, which doesn't work with
   subsequent code.
   
   I restored the old type using a cast, since that's essentially what the
   old version of Typescript was doing here.

   

   sandersn committed Sep 23, 2020
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