Tests for issues #3931 and #3932
fix for issues #3931 and #3932
Use hashCode and class name to uniquely identify the interceptor
Update documentation to highlight that the hashCode() method can be used to prevent duplication of map interceptors
Improve test to check values after stopping first node
Mention that implementing equals is a good idea
Merge pull request #3993 from dirkvanrensburg/master

Fix for issues #3931 and #3932