Add conditional conformance to Decodable and Encodable to Option

bugfix/remove-rawrep-string-init-for-option

Author: roanutil

Sources/ArgumentEncoding/Option.swift

@@ -227,6 +227,20 @@ extension Option: ExpressibleByStringInterpolation where Value: StringProtocol {
     }
 }
 
+extension Option: Decodable where Value: Decodable & CustomStringConvertible {
+    public init(from decoder: Decoder) throws {
+        let container = try decoder.singleValueContainer()
+        self.init(wrappedValue: try container.decode(Value.self))
+    }
+}
+
+extension Option: Encodable where Value: Encodable {
+    public func encode(to encoder: Encoder) throws {
+        var container = encoder.singleValueContainer()
+        try container.encode(wrappedValue)
+    }
+}
+
 // MARK: Internal Types
 
 /*