Store vargs serialized instead of custom delimited string

Regarding vargs, if we store a serialized array of arguments produced by parsing the arguments using the current input method (single text field; comma-delimited list with quotation exceptions), we need to re-quote the exceptions at edit time.

Example vargs and parsed array using parsing code from _viewfield_get_view_args():

$vargs = '[node:nid],foo,"foo, bar","foo, ""bar"", bax"'
$parsed = array('[node:nid]', 'foo', 'foo, bar', 'foo, "bar", bax');

Alternatively, we could implement a multiple value input method for arguments, and avoid the whole quotation exercise, at a significantly higher UI implementation cost.

Thoughts?

I'm going to move this to Drupal 8 as a feature request. At this time I don't see the value in altering how arguments are stored in D7 but would be on board for some UX improvements in 8.