The email addresses read from .mailmap are downcased before being
inserted into the mailmap data structure, which undesirably loses
information.  It is impossible, for instance, to map <first.last@host>
to <First.Last@host>. Demonstrate this problem.

Signed-off-by: Eric Sunshine <sunsh...@sunshineco.com>
---
 t/t4203-mailmap.sh | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/t/t4203-mailmap.sh b/t/t4203-mailmap.sh
index 8583724..ffe6a11 100755
--- a/t/t4203-mailmap.sh
+++ b/t/t4203-mailmap.sh
@@ -256,6 +256,15 @@ test_expect_success 'single-character name' '
        test_cmp expect actual
 '
 
+test_expect_failure 'preserve canonical email case' '
+       echo "     1    A U Thor <aut...@example.com>" >expect &&
+       echo "     1    nick1 <b...@company.xx>" >>expect &&
+       echo "<aut...@example.com> <aut...@example.com>" >.mailmap &&
+       test_when_finished "rm .mailmap" &&
+       git shortlog -es HEAD >actual &&
+       test_cmp expect actual
+'
+
 # Extended mailmap configurations should give us the following output for 
shortlog
 cat >expect <<\EOF
 A U Thor <aut...@example.com> (1):
-- 
1.8.3.2.804.g0da7a53

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