internal quoting in expressions can't be "" needs to be sanatised to '' (is this ok?)
 NO: root[prev.program][prev.pc] == ">" &&

might want to coerce for methods like .contains()

overly complex generated expressions, need more optimizing

change mail_example to mail (in documentation too)

Comments in long expressions, is there a way to do this?

bug (not in blaze) in low level rules, using a number as a index does not work (does not cast to string for child)

Is using a validate instead of write better for inheritance across $whildchild relations? Waht about if a user sets a child to null.
Is there a way to prevent things being nulled?