> What is the recommended place to put the code?

Personally I think it would be nice is if all extensions of standard 
ruby classes etc.. would go into a special .rb file.

This way people all can look at what is changed (IF they are interested) 
quickly.
Not sure what name would be a common ground, "core_extensions.rb" or 
"extensions.rb" or ... I dont know. But having it in one file is, I 
think, better in the long run.
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