function results' names include trailing whitespace

[Michael Sokolov]

I noticed that when you include a function as a result field, the 
corresponding key in the result markup includes trailing whitespace, 
which seems like a bug.  I wonder if anyone knows if there is a ticket 
for this already?

Example:
fl="id field(units_used) archive_id"

ends up returning results like this:

|       {
        "id":"nest.epubarchive.1",
        "archive_id":"urn:isbn:97849D42C5A01",
        "field(units_used)  ":123
                          ^
      }|

A workaround is to use something like:

fl="id field(units_used)archive_id"

instead, but it seems inelegant, and not consistent with the treatment 
of other fields

-Mike