#1 — Bogus field options appear upon toggle Object Type

We're casting a list of options to a string which produces html like:
  '<select name="..." id="...">[\'<option value=""
           
We really want to see something like the following, which suggests that the list has been appropriately joined:
  '<select name="..." id="...">\n\t<option value="" ...
           
The above issue is presenting problems in Plone 3.0.6, which is throwing a bunch of options like the following into the select list:
  [
  '\'
  ]

For some reason Plone 3.1.x handle this issue fine.