check_box_tag and params hash

I have some checkboxes like so in a form:

<%= check_box_tag "marked[#开发者_运维百科{relative_filepath}]", 1, false %>

Which produces:

<input type="checkbox" value="1" style="display: none;" name="marked[/blah]" id="marked__blah">

Now supposedly, I should there should be a hash in params[:marked], but this is nil.

What am I doing wrong?

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From railsapi.com:

"The HTML specification says unchecked check boxes are not successful, and thus web browsers do not send them."

I usually use something like params[:object][:method].to_bool.