Tivoli Directory Integrator Entry.toJSON() function produces bad JSON for single-element arrays

 TDI lets you create a JSON string from an Entry type object using that class's toJSON() method. It works like a champ UNLESS you happen to have a property that is an array with a single element, like this:

entry = system.newEntry()

entry.foobar = [ "0" ];

task.logmsg(entry.toJSON());

That will produce the following string:

{ "foo":"0" }

Whereas it should produce:

{ "foo" : [ "0" ] }

If you have two or more elements in the array, it works perfectly. 

To fix the issue, I used the following code:

goodString = entry.toJSON().replace('"foobar":"0"','"foobar":["0"]');

And now everything is good. Whew!