See: <a href="/doc/reference/classes/ucalc/expressiontransformer-=-[transformer]/">ExpressionTransformer = [Transformer]</a>, <a href="/doc/reference/classes/ucalc.transformer/fromto/">FromTo</a>, <a href="/doc/reference/classes/ucalc.rule/rewindonchange-=-[bool]/">RewindOnChange = [bool]</a>, <a href="/doc/reference/classes/ucalc.rule/removed/rewindonchange/rewindonchange-bool/">RewindOnChange(bool)</a>