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by Zikes 4626 days ago
A) Wat.

B) Somebody's gotta write those serialization libraries, and they probably do a fair amount of string manipulation to do so.

C) You can't .join data streams without buffering, which defeats the purpose.

D) Adding commas on a preceding line every time you add a new item to a list can pollute diffs.

E) Trailing commas are syntactically correct in ECMAScript 6, and supported by a fair few other languages.