Add some explicit casts to eliminate some warnings as described in issue 83 comment 17.
Add some explicit casts to eliminate some warnings as described in issue 83 comment 17.

git-svn-id: 6df6fa3ddd728f578ea1442598151d5900a6ed44@351 630680e5-0e50-0410-840e-4b1c322b438d

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