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as closures are @NoEscape by default and don't retain 'self' since Swift version 3
More info:
https://stackoverflow.com/questions/38141298/lazy-initialisation-and-retain-cycle
https://github.com/apple/swift-evolution/blob/main/proposals/0103-make-noescape-default.md
https://michael-kiley.medium.com/why-your-lazy-vars-arent-creating-strong-reference-cycles-in-ios-d512ff2c9403