That is the correct/expected behavior.

To me it would seem that if I'm getting a message about a new 'my' dec
+laration of a variable, that the new declaration would be ignored and
+ the previous value would still be in effect
[download]

I don't think any programming language behaves this way if it allows it. The latter declarations always overwrite the earlier ones. In perl, lexical scoped variables are not affected by packages.