assign does not handle null values well

[anion155]

const r = require('radash')
const result = r.assign({ a: {g:5} }, { a: null })
console.log(result)

Expected result would be { a: null }, but it is { a: {g:5} }

[MoozonWei]

I think this issue is caused by this line:

radash/src/object.ts

Line 276 in 069b26c

if (!initial || !override) return initial ?? override ?? {}

Although this assign function is designed to merge two objects, you will still encounter situations where you need to merge non-objects and objects when it make recursive calls.

Maybe we can modify this function to be able to merge objects and non-objects, then the problem will be solved.