Revert "Remove trailing commas for IE 9 compatibility" #622
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This reverts commit 4d2e46e.
Having trailing commans makes diffs easier to read as it avoids modifying a line just to add a trailing comma if there is another item to add at the end of a list. There are plans to switch to ES6 notation and to translate that to ES5 as part of the build process (#617). Since that translation would remove trailing commas, the IE9 problems that originally motivated the commit should vanish soon.