Storing complex data structures in %udat could behave different than
expected.
%udat only recognize changes in keys and values. If value is a reference
to hash or array it will not update the session data! So you must add a
dummy "changed" key and switch value from 0 to 1 or 1 to 0 if you want
to update the session data.
Harald
> Generally, only put data that you want to use on subsequent
> requests in %udat.
>
...
> Need 1: A variable that persists across all requests for a
> given browser: use %udat. Eg $udat{key} = $value
>
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