Dispatch mechanism and auto converter

[maxfischer2781]

Dispatching to specific chains for specific values allows for an easy switch/dispatch/fork/... behaviour. The dict class and its literals could easily represent it:

pre_chain >> {
  # key => chain dispatches
  str: int,
  float: round,
  # how to transform a value to derive a key
  '__transform__': type,
  # what to do if the key matches no case
  '__default__': lambda value: value  # do nothing if no key matches
} >> post_chain

• Map value => chain, then push value along chain
• Settings via __double_underscore__ names