expander code review
expander code review
expander code review
expander code review
expander code review
expander code review
expander code review
expander code review
expander code review
expander code review
expander code review
expander code review
expander code review
expander code review
expander code review
expander code review
more tests and documentation about interaction environments
more documentation on interaction environments
added optional argument to new-interaction-environment