our isn't file scoped, it's lexically scoped. If you happen to put your our at the top level, it behaves similarly to file scope. (But the storage allocated is in some package's symbol table and can be accessed from outside the file, for example with its fully qualified name.)
The syntactic range ("range" being a tentative disambiguation term I'm inventing here instead of the overloaded "scope") of our and my are identical.
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