Allow regular relays (if they have a dirport open) to be used as bridges
When we fetch a bridge descriptor and already have a descriptor with the same identity digest cached, we refuse to add the new one. This means that when we have an old descriptor with purpose general, we won't change the purpose to bridge when we configured that relay as bridge in the Tor client.
To upload designs, you'll need to enable LFS and have admin enable hashed storage. More information