Lenses in F#

Consider the following record types in F# : type Car = { Make: string Model: string Mileage: int } type Editor = { Name: string Salary: int Car: Car } type Book = { Name: string Author: string Editor: Editor }Given a Book we can trivially retrieve its editor's car mileage: let mileage = aBook.Editor.Car.MileageSetting the mileage is a bit more problematic though. If this were mutable, we could jus

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