Last "day job" I had, I just negotiated and got it removed from the contract. (I argued I'd be sending them quite some literal kilograms of paperwork, and surely that wasn't to anyone's benefit) . I don't know how common it is, but even fairly large companies will often allow some negotiation here.

(I don't like the fact that people put these kinds of clauses in in the first place either, but at least you can often opt out, fwiw)