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+* Parser
+	since parsing expressions, try with a pratt parser
+	http://journal.stuffwithstuff.com/2011/03/19/pratt-parsers-expression-parsing-made-easy/
+	http://effbot.org/zone/simple-top-down-parsing.htm
+
+Evaluator
+---------
+
+* Builtins should be built-in, there should be no need to add e.g. ``py.bool`` to the evaluation context (?)
+* Stop busyworking trivial binary operator
+* Make it *trivial* to build Python type-wrappers
+* Implement Python's `data model protocols
+  <http://docs.python.org/reference/datamodel.html#basic-customization>`_
+  for *all* supported operations, optimizations can come later
+* Automatically type-wrap everything (for now anyway)
+
+Base type requirements:
+***********************
+
+* int
+* float
+* --str-- unicode
+* bool
+* dict
+* tuple
+* list
+* ?module
+* ?object
+* datetime.time
+* datetime.timedelta
+* NotImplementedType
+
+Base methods requirement
+************************
+
+* ``__getattr__``
+* ``dict.get``
+
+In datamodel, not implemented in any type, untested
+***************************************************
+
+* a[b]
+
+* a + b, a - b, a * b, ...
+
+* +a, ~a