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In benchmarks, this alternative can run anywhere between 2x to 120x faster than Web streams in every runtime I've tested it on (including Cloudflare Workers, Node.js, Deno, Bun, and every major browser). The improvements are not due to clever optimizations, but fundamentally different design choices that more effectively leverage modern JavaScript language features. I'm not here to disparage the work that came before; I'm here to start a conversation about what can potentially come next.
That said, the JSON type is not a substitute for schema design. For columns with a known, stable structure, explicit column definitions will always provide the best performance. The right approach is to use explicit columns for the parts of your data you understand, and the JSON type for the parts that are genuinely dynamic.