If I post and get an error, instead of reloading and double-posting, hit your back button, copy your text and then reload the page. If your post made it through the firsts time, you will see it. If it didn't make it, you can paste your text and re-post it. A bit of a nuisance, but I can't remember the last time I had a dupe.
Hilariously, I got an error posting the above and had to do the above trick. Ironic.
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