Here's what the DAS for the nc/bears.nc files looks like: (From a running server: http://localhost:8080/opendap/data/nc/bears.nc.das)
But the form interface shows the values without the comma separating them. See the screenshot attached. (From a running server: http://localhost:8080/opendap/data/nc/bears.nc.html)
This is not a serious issue.
It is not a functional issue.
It is only a problem in the appearance of content in the form.