First of all thanks for that gem!
In our product we are generating sitemap using your gem.
There was a problem that I added all pages in cms and also static pages. New pages was added into cms which overlay static pages. In this case some urls was added twice.
urls should be unique
Good idea @lis2 - commit looks good to me. 👍
@alexrabarts - can you review and merge when you get a chance?
I just issued a point release, version 1.0.2, and pushed to rubygems.org