Commas aren't the only thing that need similar treatment. For example, Typescript allows a leading | for union types, and for union types split across multiple lines, the result is so much easier to format compared to the equivalent code in, say, Haskell.
TLDR:
Trailing commas for lists allows easier:
SQL needs more trailing commas so fucking badly.
Commas aren't the only thing that need similar treatment. For example, Typescript allows a leading
|for union types, and for union types split across multiple lines, the result is so much easier to format compared to the equivalent code in, say, Haskell.