fix tag comparison to correctly handle binary and hex

README.md

@@ -579,13 +579,13 @@ func main() {
 
     // Access tag elements
     fmt.Printf("Key: %s\n", eTag.Key())        // "e"
-    fmt.Printf("Value: %x\n", eTag.Value())  // event-id bytes
+    fmt.Printf("Value: %s\n", eTag.ValueHex()) // event-id as hex (handles binary storage)
     fmt.Printf("Relay: %s\n", eTag.Relay())    // relay URL
 
-    // Find tags
+    // Find tags - use ValueHex() for e/p tags (may be binary-encoded internally)
     pTags := tags.GetAll([]byte("p"))
     for _, pt := range pTags {
-        fmt.Printf("P tag: %x\n", pt.Value())
+        fmt.Printf("P tag: %s\n", pt.ValueHex()) // Always returns hex regardless of storage
     }
 
     // Filter tags

encoders/tag/tags.go

@@ -46,7 +46,8 @@ func (s *S) Append(t ...*T) {
 }
 
 // ContainsAny returns true if any of the values given in `values` matches any
-// of the tag elements.
+// of the tag elements. For e/p tags with binary-encoded values, this handles
+// comparison correctly by using ValueHex() to ensure consistent comparison.
 func (s *S) ContainsAny(tagName []byte, values [][]byte) bool {
 	if s == nil {
 		return false
@@ -54,6 +55,9 @@ func (s *S) ContainsAny(tagName []byte, values [][]byte) bool {
 	if len(tagName) < 1 {
 		return false
 	}
+	// Check if this is a binary-optimized tag type (e or p)
+	isBinaryTag := len(tagName) == 1 && (tagName[0] == 'e' || tagName[0] == 'p')
+
 	for _, v := range *s {
 		if v.Len() < 2 {
 			continue
@@ -61,8 +65,18 @@ func (s *S) ContainsAny(tagName []byte, values [][]byte) bool {
 		if !utils.FastEqual(v.Key(), tagName) {
 			continue
 		}
+
+		// For e/p tags, use ValueHex() to get consistent hex representation
+		// regardless of whether the value is stored in binary or hex format
+		var tagValue []byte
+		if isBinaryTag {
+			tagValue = v.ValueHex()
+		} else {
+			tagValue = v.Value()
+		}
+
 		for _, candidate := range values {
-			if bytes.HasPrefix(v.Value(), candidate) {
+			if bytes.HasPrefix(tagValue, candidate) {
 				return true
 			}
 		}