Wish NY did the same. In NY they get to own all your ideas both at work and "off the clock."
I cross/line out any portion of employment agreements that say such things... I've never had any push back about it.
Since it was in California it was fairly narrow (only if you used company resources, or if it was related to company products). I also had zero trouble getting sign-off for any open-source projects I wanted to contribute to.