diff --git a/api.go b/api.go
index ec819b9..2892cc9 100644
--- a/api.go
+++ b/api.go
@@ -271,29 +271,31 @@ type Event struct {
 // EventKind represents an event code for OnEvent() callbacks.
 type EventKind int
 
-// EventKindCloseStart is fired when a collection.Close() has begun.
-// The closing might take awhile to complete and an EventKindClose
-// will follow later.
-var EventKindCloseStart = EventKind(1)
-
-// EventKindClose is fired when a collection has been fully closed.
-var EventKindClose = EventKind(2)
-
-// EventKindMergerProgress is fired when the merger has completed a
-// round of merge processing.
-var EventKindMergerProgress = EventKind(3)
-
-// EventKindPersisterProgress is fired when the persister has
-// completed a round of persistence processing.
-var EventKindPersisterProgress = EventKind(4)
-
-// EventKindBatchExecuteStart is fired when a collection is starting
-// to execute a batch.
-var EventKindBatchExecuteStart = EventKind(5)
-
-// EventKindBatchExecute is fired when a collection has finished
-// executing a batch.
-var EventKindBatchExecute = EventKind(6)
+const (
+	// EventKindCloseStart is fired when a collection.Close() has begun.
+	// The closing might take awhile to complete and an EventKindClose
+	// will follow later.
+	EventKindCloseStart EventKind = 1 + iota
+
+	// EventKindClose is fired when a collection has been fully closed.
+	EventKindClose
+
+	// EventKindMergerProgress is fired when the merger has completed a
+	// round of merge processing.
+	EventKindMergerProgress
+
+	// EventKindPersisterProgress is fired when the persister has
+	// completed a round of persistence processing.
+	EventKindPersisterProgress
+
+	// EventKindBatchExecuteStart is fired when a collection is starting
+	// to execute a batch.
+	EventKindBatchExecuteStart
+
+	// EventKindBatchExecute is fired when a collection has finished
+	// executing a batch.
+	EventKindBatchExecute
+)
 
 // DefaultCollectionOptions are the default configuration options.
 var DefaultCollectionOptions = CollectionOptions{
diff --git a/store_api.go b/store_api.go
index 0cb2ec2..6a0d668 100644
--- a/store_api.go
+++ b/store_api.go
@@ -158,15 +158,17 @@ type StorePersistOptions struct {
 // behaviors associated with persistence.
 type CompactionConcern int
 
-// CompactionDisable means no compaction.
-var CompactionDisable = CompactionConcern(0)
+const (
+	// CompactionDisable means no compaction.
+	CompactionDisable CompactionConcern = iota
 
-// CompactionAllow means compaction decision is automated and based on
-// the configed policy and parameters, such as CompactionPercentage.
-var CompactionAllow = CompactionConcern(1)
+	// CompactionAllow means compaction decision is automated and based on
+	// the configed policy and parameters, such as CompactionPercentage.
+	CompactionAllow
 
-// CompactionForce means compaction should be performed immediately.
-var CompactionForce = CompactionConcern(2)
+	// CompactionForce means compaction should be performed immediately.
+	CompactionForce
+)
 
 // --------------------------------------------------------