Viewhelper syntax should be whitespace tolerant
Any viewhelper property will not work if you add whitespace around an equal sign that joins a property name and its value.
<f:render partial="List/Item" /> is OK
<f:render partial ="List/Item" /> is DEFUNCT
<f:render partial= "List/Item" /> is DEFUNCT
As an XML language Fluid should be tolerant to such whitespaces in its assignments.
Integrators will add these whitespaces easily and may debug for hours to find the cause of the resulting malfunction. (At least I did. :)