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What I mean by that is, this workaround breaks application code that depends on other portions of Rails that use XmlMini. In exchange, it allows you to potentially expose YAML to HTTP requests, which is still an extremely bad idea.

I don't see why YAML is a dangerous serialization format - the other type deserializations in the code seem sane and limited enough. (I wouldn't use YAML over e.g. JSON these days but I'm fixing up quite old projects)

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