`.btn-toolbar .btn-group {float: left}` prevents btn left of btn-group

Created by: bolinfest

Consider the following markup:

<div class="btn-toolbar">
 <button class="btn">Left button</button>
 <div class="btn-group">
   <button class="btn">LB</button>
   <button class="btn">RB</button>
 </div>
 <button class="btn">Right button</button>
</div>

One would expect "Left button" to appear left of the button group, but the reverse is true because of the .btn-toolbar .btn-group {float: left} in button-groups.less. See http://www.bootply.com/slYNLprbgV to reproduce.