Yes, I noticed this a lot with Javascript: I would often have a trailing comma at the last element of an array or object. Most browsers would let it go unremark

Yes, I noticed this a lot with Javascript: I would often have a trailing comma at the last element of an array or object. Most browsers would let it go unremarked but it was stupidly a halting error in some versions of IE. Anyway, when I made my own Vim syntax highlighter for JSON, I spent a fair amount of effort in getting such a trailing comma highlighted as an error: https://github.com/elzr/vim-json https://github.com/elzr/vim-json