https://mail.haskell.org/pipermail/ghc-devs/2014-September/006406.html
Permitting trailing commas for record syntax ADT declarations
trailing commaspermittingrecordsyntaxadt
https://www.pythonmorsels.com/trailing-commas-in-python/
The benefits of trailing commas - Python Morsels
Apr 19, 2026 - Trailing commas make for easier code changes, shorter diffs, and fewer bugs.
the benefitstrailing commaspythonmorsels