ClassCastException when building settings.xml with profiles that have activeByDefault set

I tried RC5 and got this weird error.

> >c:\dev\apache-maven-2.0.10-RC5\bin\mvn.bat site:deploy
---------------------------------------------------
constituent[0]:
file:/c:/Dev/apache-maven-2.0.10-RC5/bin/../lib/maven-2.0.10-RC5-uber.jar
---------------------------------------------------
java.lang.ClassCastException: Settings.addActiveProfiles(string)
parameter must be instanceof java.lang.String
        at org.apache.maven.settings.Settings.addActiveProfile(Settings.java:112)
        at org.apache.maven.settings.DefaultMavenSettingsBuilder.activateDefaultProfiles(DefaultMavenSettingsBuilder.jav
a:198)
        at org.apache.maven.settings.DefaultMavenSettingsBuilder.buildSettings(DefaultMavenSettingsBuilder.java:178)
        at org.apache.maven.settings.DefaultMavenSettingsBuilder.buildSettings(DefaultMavenSettingsBuilder.java:154)
        at org.apache.maven.settings.DefaultMavenSettingsBuilder.buildSettings(DefaultMavenSettingsBuilder.java:142)
        at org.apache.maven.cli.MavenCli.buildSettings(MavenCli.java:345)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:201)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
        at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
        at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
        at org.codehaus.classworlds.Launcher.main(Launcher.java:375)

When I reinstalled 2.0.10-RC5, it ran fine. Then I realized my
reinstall didn't include my custom settings.xml, but once I put that
back into /conf, everything went bonkers again. So that's where the
problem is.

You can reproduce the problem by doing the following:
- Edit the original settings.xml that comes with Maven
- Within <profiles>, add this:

<profile>
  <activation>
    <activeByDefault>true</activeByDefault>
  </activation>
</profile>

The exception from my previous email should then be given:
java.lang.ClassCastException: Settings.addActiveProfiles(string)
parameter must be instanceof java.lang.String