svn:externals no longer "read only"?

The last time I used Subversion (version 1.3), any directory marked
with svn:externals was checked out, but kept "read only". That is, you
could see the code, but not submit the changes. I recently noticed
that this no longer seems true.

I am using Subversion 1.5, on both the repository and the client. I
notice that checking out an svn:externals sub-directory is no longer
checked out "read-only". I also noticed that if I submit a change on
the external directory, the changes get reflected back into the main
directory.

Was this change done on purpose? Is there a way I can emulate the
older behavior? In certain circumstances, I don't want developers
modifying the files for external directories.

--
David Weintraub
qazwart_at_gmail.com
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