Unable to serialize as ActiveSupport::HashWithIndifferentAccess anymore

Question

For reasons that I\'m so far completely unable to decipher, I\'m no longer able to use ActiveSupport::HashWithIndifferentAccess anymore.

The relevant part of model l

Answer 1

Apparently this is just straight up broken with 1.9.2-p290.

Upgrading to 1.9.3, or downgrading to 1.8.7 and everything's peachy. I'd love a better answer than that, though, if anyone has any ideas.