+* `amazon_s3_dupindex` - Normally, when `usedirs` is enabled,
+ "foo/index.html" is stored in S3 as a key named "foo/", and all links
+ between pages use that name. If you also needs links that include
+ "index.html" in their names to work, you can enable this option. Then
+ each index.html file will be stored in S3 *twice*, under both names. This
+ will use more disk and bandwidth, and is not recommended unless you really
+ need it for some reason.