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f52f8aab95
Turns out combine's `publisher(for:,object:)` retains the object!
We verified this with a test script shown below. Fix this with a
manual filter. Found by @mustafa0x.
```
import Combine
import Foundation
final class Token {
deinit { print("Token deinitialized") }
}
weak var weakToken: Token?
var publisher: NotificationCenter.Publisher?
// Create scope that will free token.
do {
let token = Token()
weakToken = token
publisher = NotificationCenter.default.publisher(
for: Notification.Name("TestNotification"),
object: token
)
}
print("Retained:", weakToken != nil)
publisher = nil
print("Released:", weakToken == nil)
```