The typedef runtime information.
The documentation of the type. This information is only available
if the compiler flag
-D use_rtti_doc was in place. Otherwise, or if
the constructor has no documentation, the value is
The full slash path of the .hx file containing the type.
This might be
null in case there is no such file, e.g. if the
type is defined through a macro.
The type of the typedef.