class_docstr: tool for converting a function's input signature to an unique key
  
  This keymap does not serialize objects, but does do some formatting.
  Since the keys are stored as raw objects, there is no information loss,
  and thus it is easy to recover the original input signature.  However,
  to use an object as a key, the object must be hashable.
docstr: a more pickle-like interface for encoding a key
docstr_tok: ["a","more","pickle-like","interface","for","encoding","a","key"]
code: def dumps(self, obj, **kwds):
      """a more pickle-like interface for encoding a key"""
      return self.encode(obj, **kwds)
  
imports: from copy import copy
  from klepto.crypto import hash, string, pickle
label_desc: Use image node_id 13 for calling the keymap obj's underlying member method code with example usage: obj.dumps(obj) and returns: self