ruby on rails - What is the purpose of the 'metal' folder in a programming language? -

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i'm looking @ rails actioncontroller , curious meaning behind 'metal' folder is? why name 'metal'?

i know ember has ember-metal module , i'm sure there other programming use cases it.

is there convention naming 'metal'?

actionpack/lib/action_controller/metal/conditional_get.rb

from this article written david heinemeier hansson

think of rails metal subset of middleware intended application-specific end points need speed (“write metal”, hence name).


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