[Rails] ActiveSupport Dependencies load eats MultiJson.load?

I can't quite figure out what's going on here, it seems like if this were actually a problem someone else would have run into it and I'd have better luck googling for it, since MultiJson is so popular but....

Rails 3.2.9.  Is ActiveSupport::Dependencies doing something weird with a #load method defined on all objects, such that it conflicts with other objects #load method?

MultiJson wants you to use MultiJson.load to parse JSON. 

But when I try.... somehow some activesupport load is eating it instead. I get an error "Could not load file [big json string]", and this odd stacktrace:

activesupport-3.2.9/lib/active_support/dependencies.rb:245:in `load'

activesupport-3.2.9/lib/active_support/dependencies.rb:245:in `block in load'",

active_support/dependencies.rb:236:in `load_dependency'",

activesupport-3.2.9/lib/active_support/dependencies.rb:245:in `load'",

line to my app code that's actually calling MultiJson.load, but then the next line up is an active_support load instead, what now?

Anyone have any idea how I would debug this further, or what might be going on?  Any known problems with ActiveSupport adding a 'load' which kills other gems loads?

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