leading period ('.') added to directory names

$ cat dist.xml
<assembly xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.0 http://maven.apache.org/xsd/assembly-1.1.0.xsd">

<id>dist</id>
<formats>
<format>zip</format>
</formats>

<fileSets>
<fileSet>
<directory>${project.basedir}/../paper</directory>
</fileSet>
<fileSet>
<directory>${project.basedir}/../boots</directory>
</fileSet>
</fileSets>

</assembly>

$ mvn clean assembly:assembly
[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[INFO] Building oracle-sql-assembly
[INFO] task-segment: [clean]
[INFO] ------------------------------------------------------------------------
[INFO] [clean:clean

{execution: default-clean}

]
[INFO] Deleting directory F:\test-assembly\target
[INFO] ------------------------------------------------------------------------
[INFO] Building oracle-sql-assembly
[INFO] task-segment: [assembly:assembly] (aggregator-style)
[INFO] ------------------------------------------------------------------------
[INFO] Preparing assembly:assembly
[INFO] ------------------------------------------------------------------------
[INFO] Building oracle-sql-assembly
[INFO] ------------------------------------------------------------------------
[INFO] [site:attach-descriptor

{execution: default-attach-descriptor}

]
[INFO] [assembly:assembly

{execution: default-cli}

]
[INFO] Reading assembly descriptor: src/main/assembly/dist.xml
[INFO] Building zip: F:\test-assembly\target\test-assembly-3.1-SNAPSHOT-dist.zip
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESSFUL
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2 seconds
[INFO] Finished at: Mon Oct 11 15:34:37 EDT 2010
[INFO] Final Memory: 18M/45M
[INFO] ------------------------------------------------------------------------
$ unzip -l target/test-assembly-dist.zip
Archive: target/test-assembly-dist.zip
Length Date Time Name
--------- ---------- ----- ----
0 10-11-2010 15:34 test-assembly/
0 10-11-2010 15:27 test-assembly/.paper/
0 10-11-2010 15:27 test-assembly/.paper/random.txt
0 10-11-2010 15:27 test-assembly/.boots/
0 10-11-2010 15:27 test-assembly/.boots/boots.txt
--------- -------
0 5 files

Do you notice the '.paper' and '.boots' directories? It should just be 'paper' and 'boots', if I'm understanding it correctly.

I tried other versions of the plugin (e.g., beta-4), I tried removing "${project.basedir}/".

No go.

P.S. If someone points me in the right direction, like a class name, I'll write a test case.