select_tag problem or a seve (me) problem?

I'm trying to use the select_tag with :multiple => true and when it
posts to the server it's generating "---" followed by a "-" and each
selected option. I have no idea what I'm doing wrong... Any help is
appreciated.

Code in the view:

<%= select_tag 'restaurant[holidays][]', options_for_select
(["Independence Day", "Thanksgiving", "Christmas Eve", "Christmas
Day", "New Years Eve", "New Years Day"]), :multiple => true %>

After making the selections I end up with this in the log:

"holidays" = '---
- Independence Day
- Thanksgiving
- Christmas Eve
- Christmas Day
- New Years Day

HTML rendered from said action:

--- - Independence Day - Thanksgiving - Christmas Eve - Christmas Day
- New Years Day

Cheers,
Seve

The --- part is the list of selected holidays in YAML - what kind of
field are you saving them to?

--Matt Jones