.input-small causes textarea's height to shrink to a single line

Created by: gmile

This is Bootstrap 3.0 RC1.

After setting .input-small class on <textarea>, its height becomes 30px fixed. Is that supposed to be so?

Image: Example code (notice number of <textarea> rows equal to 4):

<form accept-charset="UTF-8" action="/posts" class="post form-horizontal" id="new_post" method="post">  
  <div class='fieldset'>
    <div class='form-group'>
      <div class='col-lg-6 col-offset-2'>
        <legend>New post</legend>
      </div>
    </div>
    <div class='form-group'>
      <label class="col-lg-2 control-label" for="post_title"> Title</label>
      <div class='col-lg-6'>
        <input class="form-control input-small" id="post_title" name="post[title]" type="text" />
      </div>
    </div>
    <div class='form-group'>
      <label class="col-lg-2 control-label" for="post_body"> Body</label>
      <div class='col-lg-6'>
        <textarea class="form-control input-small" id="post_body" name="post[body]" rows="4"></textarea>
      </div>
    </div>
    <div class='form-group'>
      <div class='col-lg-6 col-offset-2'>
        <input class="btn btn-default btn-small" name="commit" type="submit" value="Save" />
        <a class="btn btn-link btn-small" href="/posts">Back</a>
      </div>
    </div>
  </div>
</form>