No, none of ... are not proper usage according to the docs.

Except that they are right in the docs,

If the option 'KeyAttr => "login"' were used to specify that the 'login' attribute is a key, the same XML would parse to:

...

The key attribute names should be supplied in an arrayref if there is more than one.

In reply to Re^7: XML::Simple - Duplicate Node Overwrites by Anonymous Monk
in thread XML::Simple - Duplicate Node Overwrites by awohld

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