diff --git a/chunks/chunk.go b/chunks/chunk.go
index 9f2667a..a05eec9 100644
--- a/chunks/chunk.go
+++ b/chunks/chunk.go
@@ -42,6 +42,6 @@ const (
 	TextChunkType ChunkType = iota
 	// TagChunkType is the type of a tag Chunk "{%…%}"
 	TagChunkType
-	// TextChunkType is the type of an object Chunk "{{…}}"
+	// ObjChunkType is the type of an object Chunk "{{…}}"
 	ObjChunkType
 )
diff --git a/expressions/scanner_test.go b/expressions/scanner_test.go
index 3717320..63f8745 100644
--- a/expressions/scanner_test.go
+++ b/expressions/scanner_test.go
@@ -14,7 +14,7 @@ import (
 // 	{"{{x}}", "1"},
 // }
 
-func ScanExpression(data string) ([]yySymType, error) {
+func scanExpression(data string) ([]yySymType, error) {
 	l := newLexer([]byte(data))
 	var symbols []yySymType
 	var s yySymType
@@ -29,7 +29,7 @@ func ScanExpression(data string) ([]yySymType, error) {
 }
 
 func TestExpressionScanner(t *testing.T) {
-	tokens, err := ScanExpression("abc > 123")
+	tokens, err := scanExpression("abc > 123")
 	require.NoError(t, err)
 	require.Len(t, tokens, 3)
 }
diff --git a/filters/filters.go b/filters/filters.go
index b19b25e..2c76d08 100644
--- a/filters/filters.go
+++ b/filters/filters.go
@@ -228,9 +228,7 @@ func reverseFilter(in []interface{}) interface{} {
 
 func sortFilter(in []interface{}, key interface{}) []interface{} {
 	out := make([]interface{}, len(in))
-	for i, v := range in {
-		out[i] = v
-	}
+	copy(out, in)
 	if key == nil {
 		generics.Sort(out)
 	} else {