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I think PoC might depend on ruby >=1.9.3 because ruby/hash:Foo syntax is a newish feature. Commit where it was introduced: https://github.com/ruby/ruby/commit/8cd2bf072180a9f733ac06db...

There are at least two YAML parsing libraries (psych/syck) and they both have different behaviours as well.

But a lot of rails 3.x apps are going to be running 1.9.3

Are you going to release your PoC. Curious to see it.

A modified version has already been released by someone else and I've saw this version in another blog post before it was pulled down.

You should release your PoC(s) as well.