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FWIW, ran into an issue where using {{ contains() }} in a template was broken by this change. Specifically contains() calls substring method which even though PHP docs says needs to be a string, apparently it wasn't actually the case. In my case, there was a situation where contains() was sometimes being used on a null value. That worked pre beta 6, but not after this change.

Easy enough to fix by adding a check in the template to only check contains if it's not null... but just in case someone else runs across it.