List notation should set unknown props

[nlepage]

Only for bugs 🐛

Version : 1.0.0-rc.7

Expected behavior

set({ english: { greeting: 'Hi' } }, '{english,us}.greeting', 'Hello')
// => { english: { greeting: 'Hello' }, us: { greeting: 'Hello' } }
```js

#### Actual behavior
set({ english: { greeting: 'Hi' } }, '{english,us}.greeting', 'Hello')
// => { english: { greeting: 'Hello' } }