errors/errors.go

@@ -10,10 +10,6 @@ const (
 	ErrUnexpectedEndOfFile = erorr.Error("rfc8259: unexpected end-of-file")
 )
 
-func ErrInternalError(msg string) error {
-	return erorr.Errorf("rfc8259: JSON parser had an unexpected internal-error — %s", msg)
-}
-
 func ErrProblemReadingRune(err error) error {
 	return erorr.Errorf("rfc8259: JSON parser had a problem — problem reading rune: %w", err)
 }

naturalnumber/parse_test.go

@@ -21,10 +21,6 @@ func TestParse_success(t *testing.T) {
 			Value: []byte("0"),
 			Expected: rfc8259naturalnumber.Zero(),
 		},
-		{
-			Value: []byte("-0"),
-			Expected: rfc8259naturalnumber.Something("-0"),
-		},