anchor.diff:  
   Optional. The key pattern for endpoints.
   
  -##### `keyFrom`
  +##### `Settings.keyFrom`
   
   ```haskell
   keyFrom :: FormatPattern
   ```
   Optional. The key pattern for a publisher-position endpoint's index of subscriber-position endpoints.
   
  -##### `keyTo`
  +##### `Settings.keyTo`
   
   ```haskell
   keyTo :: FormatPattern
  
positive.code: 
  Optional. Defaults to `graph`. The key to prefix before all keys entered into Redis. Also used as the channel name prefix where graph changes are published too.
  
  ##### `keyNode`
  
  ```haskell
  keyNode :: FormatPattern
  
negative.code: 
  Optional. The key pattern for a subscriber-position endpoint's index of publisher-position endpoints.
  
  ##### `Settings.keyData`
  
  ```haskell
  keyData :: FormatPattern
  