Document limit on the number of channels that can be created in Sync Gateway and any performance implications

First comment:

Is there a hard limit to the number of channels that can be created? Is there a hard limit to how many channels a single user can subscribe to? Assuming there is not, what would be the expected performance impact of this?
For example:
solution A.
There are 1 million documents, distributed across 200 channels, with 10k users subscribed to the various channels.
solution B.
There is 1 million documents, distributed across 1 million channels (each doc in its own channel), and 10K users subscribed to those various channels.
Would solution B introduce a significant more amount of overhead/performance issues then solution A?

see other comments: https://github.com/couchbaselabs/couchbase-mobile-portal/issues/733