Your latter example (mandatory between items on the same line but optional at the end of a line) is pretty much exactly how CoffeeScript objects and arrays work, so there's definitely precedent for that!
Then again, CoffeeScript and its relatives aren't exactly widely considered a pinnacle of good language design. Useful, but not exactly elegant.
Yeah, it's precedent, but not necessarily good precedent :p
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Your latter example (mandatory between items on the same line but optional at the end of a line) is pretty much exactly how CoffeeScript objects and arrays work, so there's definitely precedent for that!
Then again, CoffeeScript and its relatives aren't exactly widely considered a pinnacle of good language design. Useful, but not exactly elegant.
Yeah, it's precedent, but not necessarily good precedent :p