evaluation of rendered attribute

[Michael Heinen]

I am a little bit surprised that the rendered attribute of t:column evaluates to true for null values. e.g. <t:column rendered="#{null}"> means that the column is rendered.   I expected a behaviour like in Boolean.parseBoolean(String) method. 'The boolean returned represents the value true if the string argument is not null and is equal, ignoring case, to the string "true"'   It is ok that true is the default value of this attribute but if the rendered attribute is specified and the value could not be evaluated to a boolean then I would expect false as result.   Why does this differ and is it expected to work this way? I think it causes additional work because null checks have to be added.   Michael