Could useful set the tag of  a collection when you render it, like
backboneJS?

for example , given a partial:
```erb
<span><%=post.autor%></span>
<span><%=post.created_at%></span>
```
you could render inside two different tags

```erb
<ul>
<%= render @posts,:tag=>'li'%>
</ul>
```
output:

```html
<ul>
<li>
 <span>one</span>
 <span>Tomorrow</span>
 </li>

<li>
 <span>two</span>
 <span>Today</span>
 </li>
</ul>
```
or

```erb
<div>
<%= render @posts,:tag=>'div'%>
</div>
```
output:

```html
<div>
<div>
 <span>one</span>
 <span>Tomorrow</span>
 </div>

<div>
 <span>two</span>
 <span>Today</span>
 </div>
</div>

```
or without any tag

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