Use synthesized implementation

Sources/Schedule/Bag.swift

@@ -8,11 +8,6 @@ struct BagKey: Equatable {
     fileprivate init(underlying: UInt64) {
         self.i = underlying
     }
-
-    /// Returns a Boolean value indicating whether two BagKeys are equal.
-    static func == (lhs: BagKey, rhs: BagKey) -> Bool {
-        return lhs.i == rhs.i
-    }
 }
 
 /// A generator that can generate a sequence of unique `BagKey`.

Sources/Schedule/Interval.swift

@@ -12,13 +12,7 @@ public struct Interval {
     }
 }
 
-extension Interval: Hashable {
-
-    /// Returns a boolean value indicating whether two intervals are equal.
-    public static func == (lhs: Interval, rhs: Interval) -> Bool {
-        return lhs.nanoseconds == rhs.nanoseconds
-    }
-}
+extension Interval: Hashable { }
 
 extension Interval {
 

Sources/Schedule/TaskCenter.swift

@@ -8,15 +8,12 @@ extension TaskCenter {
 
         weak var task: Task?
 
-        let hash: Int
-
         init(_ task: Task) {
             self.task = task
-            self.hash = task.hashValue
         }
 
         func hash(into hasher: inout Hasher) {
-            hasher.combine(hash)
+            hasher.combine(task)
         }
 
         static func == (lhs: TaskBox, rhs: TaskBox) -> Bool {