The Jira Misc Custom Fields addon has some basic documentation, but I can't find the JavaDocs for the custom classes it uses, and I don't know what methods are available for it.
There's https://innovalog.atlassian.net/wiki/spaces/JMCF/overview but it's very basic.
I want to get the issue key for the "issue" variable that's present when executing a script in a calculated text or number field. issue.getKey() doesn't work, which is normally available for a MutableIssue or Issue object.
I can see that the class if the "issue" variable is com.innovalog.jmcf.fields.IssueProxy
However, there's no documentation on this class I can find. All I can see is issue.get('custom_field_name'), which isn't what I need.
Simple, how can I get the issue key? More broadly, how can I see the JavaDoc for methods available and inherited methods for what they extend? Is this published?