 
  When `query` returns some set of values, each value is being passed into `effects` lambda to decide which effects should be performed.
 
- In case new `query` contains some elements of the previous one, those effects are not interrupted.
- In case new `query` doesn't contain some elements of the previous one, effects for those elements are cancelled.
- In case new `query` contains some new elements, they are being passed to the `effects` lambda and resulting effects are being performed.
+ * Effects are not interrupted for elements in the new `query` that were present in the `old` query.
+ * Effects are cancelled for elements present in `old` query but not in `new` query.
+ * In case new elements are present in `new` query (and not in `old` query) they are being passed to the `effects` lambda and resulting effects are being performed.
 
  - parameter query: Part of state that controls feedback loop.
  - parameter effects: Chooses which effects to perform for certain query element.

 * State: State type of the system.
 * Query: Subset of state used to control the feedback loop.

 When `query` returns some value, that value is being passed into `effects` lambda to decide which effects should be performed.
 In case new `query` is different from the previous one, new effects are calculated by using `effects` lambda and then performed.

 When `query` returns `nil`, feedback loops doesn't perform any effect.


 When `query` returns some set of values, each value is being passed into `effects` lambda to decide which effects should be performed.

 * Effects are not interrupted for elements in the new `query` that were present in the `old` query.
 * Effects are cancelled for elements present in `old` query but not in `new` query.
 * In case new elements are present in `new` query (and not in `old` query) they are being passed to the `effects` lambda and resulting effects are being performed.

 - parameter query: Part of state that controls feedback loop.
 - parameter effects: Chooses which effects to perform for certain query element.
