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Usually when you submit something that's already been submitted semi-recently, it'll send you to that submission and up vote it automatically. It matches the URL

I'm not sure if theres a timeframe for this - I've seen it on something as long as a few months.

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That is true if the urls are the same but in the previously submitted one #readme is appended and this one lacks that.

I believe that dups with the same url are caught as long as they are in memory on the server.

The URL comparator appears to be a simple (case-sensitive!) string comparison. There are many ways around the dupe filter.

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