Merge branch 'polymorphic'

* polymorphic: (41 commits)
  fix shadowed variable warnings
  polymorphic around callbacks
  polymorphic after filter
  rename terminal to halting, try to keep naming consistent
  push the before filter lambdas to factory methods
  polymorphic before callbacks
  use a singleton end node
  Revert "we never pass blocks, so remove this"
  if there is nothing to compile, then do not bother compiling
  Arrays are no longer supported
  we never pass blocks, so remove this
  raise an argument error if the filter arity is greater than 1
  pass the actual filter, not a string
  do not keep a reference to the chain in the callback objects
  fix deprecation test
  push merge code to the callback itself
  dup the callback and set the chain
  remove klass because it is not used
  rename instance variables
  push duplicates? logic to the instance
  ...

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