4 files changed, 7 insertions, 7 deletions
diff --git a/internal/feed/cache/cache.go b/internal/feed/cache/cache.go
index 311e871..8029ee0 100644
--- a/internal/feed/cache/cache.go
+++ b/internal/feed/cache/cache.go
@@ -24,7 +24,7 @@ const (
 type Impl interface {
 	cachedFeed(*feed.Feed) CachedFeed
 	transformTo(Version) (Impl, error)
-	cleanup(knownDescriptors map[feed.Descriptor]bool)
+	cleanup(knownDescriptors map[feed.Descriptor]struct{})
 	load(io.Reader) error
 	store(io.Writer) error
 	Version() Version
diff --git a/internal/feed/cache/state.go b/internal/feed/cache/state.go
index ce6723a..dfdefa1 100644
--- a/internal/feed/cache/state.go
+++ b/internal/feed/cache/state.go
@@ -11,7 +11,7 @@ import (
 type State struct {
 	feeds       map[string]*feed.Feed
 	cachedFeeds map[string]CachedFeed
-	knownFeeds  map[feed.Descriptor]bool
+	knownFeeds  map[feed.Descriptor]struct{}
 	cache       Cache
 	cfg         *config.Config
 }
@@ -56,7 +56,7 @@ func (state *State) LoadCache(fileName string, forceNew bool) error {
 
 	for name, feed := range state.feeds {
 		state.cachedFeeds[name] = cache.cachedFeed(feed)
-		state.knownFeeds[feed.Descriptor()] = true
+		state.knownFeeds[feed.Descriptor()] = struct{}{}
 	}
 
 	// state.feeds should not be used after loading the cache --> enforce a panic
@@ -122,7 +122,7 @@ func NewState(cfg *config.Config) (*State, error) {
 	state := State{
 		feeds:       make(map[string]*feed.Feed, numFeeds),
 		cachedFeeds: make(map[string]CachedFeed, numFeeds),
-		knownFeeds:  make(map[feed.Descriptor]bool, numFeeds),
+		knownFeeds:  make(map[feed.Descriptor]struct{}, numFeeds),
 		cache:       Cache{}, // loaded later on
 		cfg:         cfg,
 	}
diff --git a/internal/feed/cache/v1.go b/internal/feed/cache/v1.go
index 5675db5..1c64513 100644
--- a/internal/feed/cache/v1.go
+++ b/internal/feed/cache/v1.go
@@ -377,9 +377,9 @@ func filterItems(items []cachedItem) []cachedItem {
 	return copiedItems
 }
 
-func (cache *v1Cache) cleanup(knownDescriptors map[feed.Descriptor]bool) {
+func (cache *v1Cache) cleanup(knownDescriptors map[feed.Descriptor]struct{}) {
 	for descr, id := range cache.Ids {
-		if knownDescriptors[descr] {
+		if _, ok := knownDescriptors[descr]; ok {
 			// do not delete stuff still known to us
 			continue
 		}
diff --git a/internal/feed/cache/v2.go b/internal/feed/cache/v2.go
index 2abf2a8..5d6ff9e 100644
--- a/internal/feed/cache/v2.go
+++ b/internal/feed/cache/v2.go
@@ -29,7 +29,7 @@ func (cache *v2Cache) transformTo(v Version) (Impl, error) {
 	return nil, fmt.Errorf("Transformation not supported")
 }
 
-func (cache *v2Cache) cleanup(knownDescriptors map[feed.Descriptor]bool) {
+func (cache *v2Cache) cleanup(knownDescriptors map[feed.Descriptor]struct{}) {
 	cache.asV1().cleanup(knownDescriptors)
 }