Exceptional performance of namespace import object values

[XiSenao]

Rollup Version

4.12.0

Operating System (or Browser)

Mac

Node Version (if applicable)

v18.12.0

Link To Reproduction

https://stackblitz.com/edit/rollup-repro-5w6buu?file=src%2Fmain.js

Expected Behaviour

I personally feel that properties should not be accessed in the prototype chain.

Case 1:  undefined true
Case 2:  undefined true

Actual Behaviour

Case 1:  undefined true
Case 2:  Name: B false

[Simon-He95]

It seems that ImportNamespaceSpecifier should be used and the data should be shallowly copied.