Is there any functional reason for the wheel joints to be continuous instead of fixed?

edit

The create.urdf.xacro file labels the wheel joints as continuous:

<joint name="right_wheel_joint" type="continuous">

but then turtlebot_node.py publishes a transform for that joint that never changes.

It seems like that is just adding overhead.

Is there any reason not to just set the wheels to fixed like this:

<joint name="right_wheel_joint" type="fixed">

It appears to work from testing, but I am afraid that it might come back to bite me later in something like gmapping or some other future use of my robot that I haven't tested yet.

Can anyone tell me if a fixed wheel joint will have any negative repercussions, other than an inability to "animate" it in RVIZ?