Updateable protocol issue with null values

[ipodishima]

Vapor Toolbox: 2.0.3
Vapor Framework: 2.1.2

Given the following code, Updateable protocol can not convert null to nil for the string as expected:

final class Reminder: Model {

    var calendarItemIdentifier: String?

 struct Properties {
        static let idKey                     = "id"
        static let calendarItemIdentifierKey = "calendar_item_identifier"
    }

 init(row: Row) throws {
        calendarItemIdentifier = try? row.get(Properties.calendarItemIdentifierKey)
}

 func makeRow() throws -> Row {
        var row = Row()
        try row.set(Properties.calendarItemIdentifierKey, calendarItemIdentifier)
}

extension Reminder: Preparation {
    static func prepare(_ database: Database) throws {
        try database.create(self) { reminder in
            reminder.id()
            reminder.string(Properties.calendarItemIdentifierKey, optional: true)
        }
    }
    
    static func revert(_ database: Database) throws {
        try database.delete(self)
    }
}

extension Reminder: Updateable {
    public static var updateableKeys: [UpdateableKey<Reminder>] {
        return [
            UpdateableKey(Properties.calendarItemIdentifierKey, String.self) { object, calendarItemIdentifier in
                object.calendarItemIdentifier = calendarItemIdentifier
            }
        ]
    }
}

Attempting to patch through

    func update(req: Request, reminder: Reminder) throws -> ResponseRepresentable {
        try reminder.update(for: req)
        
        try reminder.save()
        return try reminder
    }

With

{
  "calendar_item_identifier": null
}

Fluent is throwing an error

[tanner0101]

You need to use String? instead of String if you want to support nil.

UpdateableKey(Properties.calendarItemIdentifierKey, String?.self)

Feel free to reopen if this doesn't fix the issue.