<blockquote><blockquote> Safari 6.1 is identical to Safari 7 engine-wise</blockquote>

It's not identical btw, webkit versions are different and there is a plenty of resources that confirm this (for <a href="https://twitter.com/toolmantim/status/344615837728137216">example</a>), how did you determined which one of them is "real"?</blockquote>
I don't understand your link, it doesn't say anything about 6.1/7 differences. I also just confirmed on BrowserStack that both 6.1 and 7.0 have the same WebKit version, i.e. 537.71, what is your source?

Anyway, wherever I've read about standards-related changes, Safari 6.1 & 7.0 were described together.

<blockquote>
It's not one digit, see `launchers` module and see my previous comment and as i said, what browsers we need to test is a long and debatable question, we shouldn't clubber this discussion, this PR mostly provides an answer for "how" not for "what".
</blockquote>
OK, I'll leave it here then. I still think it'd be good to update it all just before merging and wanted to point out the mistake here but if you insist it can be done later.