However, this implementation has advantage of using the tied variable as constant in a string which can be interpolated.

And the benefit of interpolating a compile-time constant into a string at runtime is? 

use constant AVO => 6;

...

print "The constant is " . AVO . "\n";

[download]

Or

printf "The constant is %d\n", AVO;

print "The constant is ${ \AVO }";;

[download]
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In reply to Re^3: question regarding "Tie" in Perl by BrowserUk
in thread question regarding "Tie" in Perl by lightoverhead

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