Version

2.6.8

Reproduction link

https://jsfiddle.net/bqzu8crg/

Steps to reproduce

Since this change, whenever an element updates which has one of its domProps set to undefined or null, that prop is instead set to ''.
All you need to do to reproduce it is render an element with properties in domProps set to null or undefined, and then update the component.

What is expected?

The domProps values retain their correct types.

What is actually happening?

The domProps become strings, instead.