null is treated as undefined

[danielroe]

When passing in a new object where some of the properties are null, the defaults are used instead. I would expect this only be true for undefined properties.

Repro: https://codesandbox.io/s/defu-repro-o1l04

[pi0]

Hi, @danielroe thanks for making the issue.

This is by design that null being skipped as defu was originally written based to be defaults-deep spect compatible and actually for option defaults I think makes sense to disable options via explicit boolean.

I did research these are modules ignoring null:

• defu
• defaults-deep
• assign-deep
• extend-shallow
• merge-deep
• mixin-deep

Modules not ignoring null:

• omit-deep
• lodash.defaultsdeep