Make the types in the module conform to Sendable

Author: koher

Sources/SwiftYMD/DayOfWeek.swift

@@ -23,3 +23,5 @@ extension DayOfWeek: CustomStringConvertible {
         }
     }
 }
+
+extension DayOfWeek: Sendable {}

Sources/SwiftYMD/Month.swift

@@ -68,3 +68,5 @@ extension Month: CustomStringConvertible {
         }
     }
 }
+
+extension Month: Sendable {}

Sources/SwiftYMD/YM.swift

@@ -89,6 +89,8 @@ extension YM: CustomStringConvertible {
     }
 }
 
+extension YM: Sendable {}
+
 extension YM {
     public static func + (lhs: YM, rhs: YMInterval) -> YM {
         switch rhs {

Sources/SwiftYMD/YMD.swift

@@ -83,6 +83,8 @@ extension YMD: CustomStringConvertible {
     }
 }
 
+extension YMD: Sendable {}
+
 extension YMD {
     public static func + (lhs: YMD, rhs: YMDInterval) -> YMD {
         switch rhs {

Sources/SwiftYMD/YMDInterval.swift

@@ -5,6 +5,8 @@ public enum YMDInterval {
     case weeks(Int)
 }
 
+extension YMDInterval: Sendable {}
+
 extension YMDInterval {
     public static prefix func + (value: YMDInterval) -> YMDInterval {
         value

Sources/SwiftYMD/YMInterval.swift

@@ -3,6 +3,8 @@ public enum YMInterval {
     case months(Int)
 }
 
+extension YMInterval: Sendable {}
+
 extension YMInterval {
     public static prefix func + (value: YMInterval) -> YMInterval {
         value

Sources/SwiftYMD/Year.swift

@@ -64,6 +64,8 @@ extension Year: ExpressibleByIntegerLiteral {
     }
 }
 
+extension Year: Sendable {}
+
 extension Year {
     public static func + (lhs: Year, rhs: Year) -> Year {
         .init(rawValue: lhs.rawValue + rhs.rawValue)