fix: deepCopy should never merge arrays

packages/shared/src/messages.ts

@@ -12,21 +12,22 @@ export function deepCopy(src: any, des: any): void {
  while (stack.length) {
  const { src, des } = stack.pop()!
 
+ // using `Object.keys` which skips prototype properties
  Object.keys(src).forEach(key => {
  // if src[key] is an object/array, set des[key]
  // to empty object/array to prevent setting by reference
  if (isObject(src[key]) && !isObject(des[key])) {
  des[key] = Array.isArray(src[key]) ? [] : {}
  }
 
- if (isObject(des[key]) && isObject(src[key])) {
- // src[key] and des[key] are both objects, merge them
- stack.push({ src: src[key], des: des[key] })
- } else {
+ if (isNotObjectOrIsArray(des[key]) || isNotObjectOrIsArray(src[key])) {
  // replace with src[key] when:
  // src[key] or des[key] is not an object, or
  // src[key] or des[key] is an array
  des[key] = src[key]
+ } else {
+ // src[key] and des[key] are both objects, merge them
+ stack.push({ src: src[key], des: des[key] })
  }
  })
  }