1 files changed, 35 insertions, 7 deletions

diff --git a/encode.go b/encode.go
index c881369..af7c57e 100644
--- a/encode.go
+++ b/encode.go
@@ -48,7 +48,7 @@ func Encode(w io.Writer, obj any) (err error) {
 			}
 		}
 	}()
-	encode(w, reflect.ValueOf(obj), false, 0, map[unsafe.Pointer]struct{}{})
+	encode(w, reflect.ValueOf(obj), false, 0, map[any]struct{}{})
 	if f, ok := w.(interface{ Flush() error }); ok {
 		return f.Flush()
 	}
@@ -63,7 +63,7 @@ var (
 
 const startDetectingCyclesAfter = 1000
 
-func encode(w io.Writer, val reflect.Value, quote bool, cycleDepth uint, cycleSeen map[unsafe.Pointer]struct{}) {
+func encode(w io.Writer, val reflect.Value, quote bool, cycleDepth uint, cycleSeen map[any]struct{}) {
 	if !val.IsValid() {
 		encodeWriteString(w, "null")
 		return
@@ -83,7 +83,15 @@ func encode(w io.Writer, val reflect.Value, quote bool, cycleDepth uint, cycleSe
 			encodeWriteString(w, "null")
 			return
 		}
-		if err := obj.EncodeJSON(w); err != nil {
+		validator := &ReEncoder{Out: w}
+		if err := obj.EncodeJSON(validator); err != nil {
+			panic(encodeError{&EncodeMethodError{
+				Type:       val.Type(),
+				Err:        err,
+				SourceFunc: "EncodeJSON",
+			}})
+		}
+		if err := validator.Close(); err != nil {
 			panic(encodeError{err})
 		}
 
@@ -102,9 +110,17 @@ func encode(w io.Writer, val reflect.Value, quote bool, cycleDepth uint, cycleSe
 		}
 		dat, err := obj.MarshalJSON()
 		if err != nil {
+			panic(encodeError{&EncodeMethodError{
+				Type:       val.Type(),
+				Err:        err,
+				SourceFunc: "MarshalJSON",
+			}})
+		}
+		validator := &ReEncoder{Out: w}
+		if _, err := validator.Write(dat); err != nil {
 			panic(encodeError{err})
 		}
-		if _, err := w.Write(dat); err != nil {
+		if err := validator.Close(); err != nil {
 			panic(encodeError{err})
 		}
 
@@ -123,7 +139,11 @@ func encode(w io.Writer, val reflect.Value, quote bool, cycleDepth uint, cycleSe
 		}
 		text, err := obj.MarshalText()
 		if err != nil {
-			panic(encodeError{err})
+			panic(encodeError{&EncodeMethodError{
+				Type:       val.Type(),
+				Err:        err,
+				SourceFunc: "MarshalText",
+			}})
 		}
 		encodeString(w, text)
 
@@ -302,7 +322,15 @@ func encode(w io.Writer, val reflect.Value, quote bool, cycleDepth uint, cycleSe
 				encodeWriteByte(w, '"')
 			default:
 				if cycleDepth++; cycleDepth > startDetectingCyclesAfter {
-					ptr := val.UnsafePointer()
+					// For slices, val.UnsafePointer() doesn't return a pointer to the slice header
+					// or anything like that, it returns a pointer *to the first element in the
+					// slice*.  That means that the pointer isn't enough to uniquely identify the
+					// slice!  So we pair the pointer with the length of the slice, which is
+					// sufficient.
+					ptr := struct {
+						ptr unsafe.Pointer
+						len int
+					}{val.UnsafePointer(), val.Len()}
 					if _, seen := cycleSeen[ptr]; seen {
 						panic(encodeError{&EncodeValueError{
 							Value: val,
@@ -353,7 +381,7 @@ func encodeString[T interface{ []byte | string }](w io.Writer, str T) {
 	encodeWriteByte(w, '"')
 }
 
-func encodeArray(w io.Writer, val reflect.Value, cycleDepth uint, cycleSeen map[unsafe.Pointer]struct{}) {
+func encodeArray(w io.Writer, val reflect.Value, cycleDepth uint, cycleSeen map[any]struct{}) {
 	encodeWriteByte(w, '[')
 	n := val.Len()
 	for i := 0; i < n; i++ {