mktables: Don't add exact duplicate to tables

This was a bug in the case where there can be multiple entries in a
table for a single code point.  But there only can be one identical
entry.

1 files changed, 4 insertions, 1 deletions

diff --git a/lib/unicore/mktables b/lib/unicore/mktables
index 39935a4f31..64f7522533 100644
--- a/lib/unicore/mktables
+++ b/lib/unicore/mktables
@@ -3677,9 +3677,12 @@ sub trace { return main::trace(@_); }
             }
 
             # If to place this new record after, move to beyond all existing
-            # ones.
+            # ones; but don't add this one if identical to any of them, as it
+            # isn't really a multiple
             if ($replace == $MULTIPLE_AFTER) {
                 while ($i < @$r && $r->[$i]->start == $start) {
+                    return if $value eq $r->[$i]->value
+                              && $type eq $r->[$i]->type;
                     $i++;
                 }
             }