Add more client side checks #1547
Such client side limitations can be problematic in the future and it's clear this is not the best way to go about it, yet I wonder if there're any downsides doing this anyway. We won't be able to go over 100 peers like ever. There are just so many practical issues (IsStandard, Tor, too-long-mempool-chain) with this.
Note I did 110 instead of 100 to give some wiggle room.