Add a custom defaultsDeep that replaces arrays rather than merge them

[weotch]

See

• https://github.com/lodash/lodash/pull/2802#issuecomment-259727419
• https://github.com/lodash/lodash/blob/ddfd9b11a0126db2302cb70ec9973b66baec0975/lodash.js#L12836-L12839
• https://stackoverflow.com/a/66247134/59160

Also, from https://stackoverflow.com/a/33247597/59160

[weotch]

I can use this to refactor code like this: https://github.com/BKWLD/cloak-boilerplate/blob/a1b2e0b41e489bb89157ad469655b9d9279a93a3/modules/routing.js#L24-L27

[weotch]

Actually, I think I can use this package, written by Nuxt team and already a dep, for this: https://github.com/unjs/defu ... i may need a custom merger though, because defu concats arrays by default. Also, the orders is reverse, defaults go in the second argument.