Merge pull request #36 from tdakkota/fix/keep-head-non-negative

fix: do not unread, if next was failed

dec_read.go

@@ -7,8 +7,10 @@ import (
 
 // Next gets Type of relatively next json element
 func (d *Decoder) Next() Type {
-	v, _ := d.next()
-	d.unread()
+	v, err := d.next()
+	if err == nil {
+		d.unread()
+	}
 	return types[v]
 }
 

dec_read_test.go

@@ -1,6 +1,7 @@
 package jx
 
 import (
+	"io"
 	"strings"
 	"testing"
 
@@ -19,3 +20,13 @@ func TestDecoder_consume(t *testing.T) {
 	d := Decode(r, 1)
 	require.ErrorIs(t, d.consume('"'), r.Err())
 }
+
+func TestDecoder_Next(t *testing.T) {
+	d := DecodeBytes(nil)
+	d.Next()
+	d.Next()
+	d.Next()
+
+	_, err := d.Str()
+	require.ErrorIs(t, err, io.ErrUnexpectedEOF)
+}