From c2404189eb4800764de13f28abc0bca2b3b5d848 Mon Sep 17 00:00:00 2001
From: Martin Czygan <martin.czygan@gmail.com>
Date: Tue, 8 Jun 2021 22:02:41 +0200
Subject: map: tweak isbn

---
 skate/map.go | 15 +++------------
 1 file changed, 3 insertions(+), 12 deletions(-)

diff --git a/skate/map.go b/skate/map.go
index 17d9ed2..a6dc5f3 100644
--- a/skate/map.go
+++ b/skate/map.go
@@ -289,21 +289,12 @@ func MapperOpenLibraryReleaseNormalizedISBN(p []byte) (fields [][]byte, err erro
 	}
 	// There can be 10 and 13 variants in the data, we always want 13.
 	for _, isbn := range doc.ExtIDs.ISBN {
-		if len(isbn) == 13 {
-			isbn13 = isbn
+		parsed := ParseIsbn(isbn)
+		if len(parsed) > 0 {
+			isbn13 = parsed[0]
 			break
 		}
 	}
-	if isbn13 == "" {
-		// This is rarer, more expensive.
-		for _, isbn := range doc.ExtIDs.ISBN {
-			parsed := ParseIsbn(isbn)
-			if len(parsed) > 0 {
-				isbn13 = parsed[0]
-				break
-			}
-		}
-	}
 	if isbn13 == "" {
 		return nil, nil
 	} else {
-- 
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