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=============================================================================== Mid.js ===============================================================================
Super simple middleware!
Create a new middleware, both the stack array and object to be mixed into are optional. Returns obj, or the exec function itself.
Call each function in the stack with the arguments. cb is called with no arguments when the stack finishes, or with an error when if/when one occurs.
Add fn to the middleware's stack.
The actual array of functions that the middleware uses as a stack, exposed in case you want to do something crazy and undocumented/untested.