If the behaviour change between version of Perl, it is unreliable. In the ENV (of your OS) values will always be stringyfied, older Perl version had permit you to add datastructure to %ENV, but this is not logic as Env will contain only strings. So the behaviour was corrected.
See also Environment and wikipedia too.

L*
There are no rules, there are no thumbs..
Reinvent the wheel, then learn The Wheel; may be one day you reinvent one of THE WHEELS.

In reply to Re^3: Cannot write data struct to %ENV by Discipulus
in thread Cannot write data struct to %ENV by exilepanda

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