dots in mongo

> db.testdots.save({foo: 'bar', tags: ['web2.0', 'mongofail']})
> db.testdots.findOne();
{
	"_id" : ObjectId("4bb7992356756e741e3574a1"),
	"foo" : "bar",
	"tags" : [
		"web2.0",
		"mongofail"
	]
}
> 


> db.testdots.find({tags: 'web2.0'})
{ "_id" : ObjectId("4bb7992356756e741e3574a1"), "foo" : "bar", "tags" : [ "web2.0", "mongofail" ] }