unexpected loop behavior when rendering templates.

Hello and thank you so much for this wonderful language!

Hyperscript completely solves all my tasks on the front end, with the exception of a small problem: SET command in the template's loop doesn't work.

The code from the example of using templates does not work:
```

@repeat in colors
@set bg to it -- this command return lenght of it, but not it as Object
@set fg to getContrastingColor(it) -- the same problem

• ${bg}

@end

```

And this code works:
```

@repeat in colors

```

I found a workaround: using loops directly in DOM elements (when more complex logic is required). I'm not very versed in JavaScript (that's why I chose Hyperscript) to send the pull request, but I hope that this bug causes inconvenience to someone else and it can be fixed.