The sub fiddleHash is only supposed to alter hash2 but it also alters hash1

Since you use this my %hash2 = %hash1;, then do this 

print %hash2;
print %hash1;

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Then you will see why!

If you tell me, I'll forget.
If you show me, I'll remember.
if you involve me, I'll understand.
--- Author unknown to me

In reply to Re: changing copy of a hash changes original by 2teez
in thread changing copy of a hash changes original by edo

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