checklink re-checks links in when recursive option is on

When running the W3C link checker recursively, it re-checks links that
it has already checked.

E.g.:
www.foo.com/page2.html links to www.foo.com/index.html
www.foo.com/page3.html links to www.foo.com/index.html

Checking the link for www.foo.com/index.html a second (or third, or
fourth, or one thousandth) time is time-consuming and seems
unnecessary.

Are there any plans to cache results for particular links and check
the cache before sending a duplicate page request?


Thanks,
Chris