I haven't really started on ErlyWeb yet, I'm sort of feeding on 
information from tutorials and such.

Here's the blog post I'm currenly looking at: 
http://progexpr.blogspot.com/2006/12/erlyweb-blog-tutorial.html

The tutorial has a a entry model that has a value field. However, the 
author had to build a helper to handle returned values:
    ...
    helpers:value(entries:title(Entry))
    ...

    -module(helpers).
    -export([value/1]).

    value(Val) ->
    case Val of
     undefined ->
      "";
     _ ->
      Val
    end.

May be we could add hints as well as the desired "default" values for 
field accessors. Something like this:
    entries:title(Entry, as_string) %% meaning binary
    entries:title(Entry, as_string, <<>>) %% returning an empty binary 
when the field is NULL/undefined
    entries:comment_count(Entry, as_integer)
etc. Or something to this effect...

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