Maybe this is a bug (or undocumented feature) in YAML.

I have a similar problem in Rails (but ActiveRecord is not involved in 
this workflow):

I YAML.dump a Hash that contains attributes
that I want to pass to a MyModel#new method. But when I YAML.load the
resulting yaml, the key :id is not in the Hash anymore! I tried to
reproduce this behavior with a simpler Hash, but i wasn't able to.

My current workaround is to rename the key ":id" to ":_id" before
dumping and rename it back after loading...

Ephraim

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