added normalized_url, which does:
- lowercase the scheme and host (e.g. HTTPS -> https, .COM -> .com)
- strip www.
- remove ports
- remove fragment (e.g. /page#thing -> /page)
- remove tracking params (e.g. ?utm_source=smth&share_id=xyz&id=abc -> ?id=abc)
- strip index page, or at least the ones i could think of
- remove trailing /
- canonicalize percent encoding
also did some perf work, tho it probs wont be very noticeable