anchor.diff:  Example:
   
   ```java
  -ChronicleMap<Integer, PostalCodeRange> cityPostalCodes = ChronicleMap
  +ChronicleMap<CharSequence, PostalCodeRange> cityPostalCodes = ChronicleMap
       .of(CharSequence.class, PostalCodeRange.class)
       .name("city-postal-codes-map")
       .averageKey("Amsterdam")
  
positive.code: 
  // Or shorter form, without builder variable extraction:
  
  ChronicleMap<Integer, PostalCodeRange> cityPostalCodes = ChronicleMap
      .of(CharSequence.class, PostalCodeRange.class)
      .name("city-postal-codes-map")
      .averageKey("Amsterdam")
  
negative.code: `recoverPersistedTo(persistenceFile, sameLibraryVersion)`, if the file already exists. For example:
  
  ```java
  ChronicleMap<CharSequence, PostalCodeRange> cityPostalCodes = ChronicleMap
      .of(CharSequence.class, PostalCodeRange.class)
      .averageKey("Amsterdam")
      .entries(50_000)
  