Nontrailing separators do not spark joy

5 hours ago

Trailing commas in JSON are not allowed, which complicates editing by requiring different text transformations depending on where elements are added or removed.
Other languages like Haskell, TLA+, and Prolog also restrict trailing separators, leading to similar editing challenges, with Prolog using periods to terminate rules.
Some languages, such as Python and Go, allow trailing commas in data structures, improving editability, but typically do not permit leading separators.
Alloy is highly flexible, allowing both leading and trailing commas, and even empty separators, though this can be seen as excessive.
Arguments against trailing separators include potential parsing ambiguities, as seen in Prolog and Ruby, where control separators could be misinterpreted.
Python uses trailing commas to distinguish single-element tuples from grouped expressions, highlighting a practical use case for trailing data separators.

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