Noticed if we try to change attribute name to an already existing attribute name, it behaves 'weirdly'.
First of all, it does not complain about duplicated names.
Second, it change 'type' and 'default' of existing one, instead of changing the original one.
And finally, it does not update the attribute list, we need to refresh the component to see any changes.

 
Steps to reproduce:

1. import VFC with attribute (from attached file)
2. confirm imported attributes (see attached Step2.png)
3. edit 'test_1' and change name to 'test_4' (see attached Step3.png)