jQuery core.js "+i" statement, mistake or trick?
<p>In jQuery core.js, <a href="https://github.com/jquery/jquery/blob/master/src/core.js#L260" rel="nofollow">currently, line 260</a></p>

<p>this.slice( i, +i + 1 );</p>

<p>is the "+i" statement a mistake or some fancy trickery I can't find any mention of? </p>
