Redis Gets First New Data Type in Years: Arrays by antirez — 18 Commands, 4 Months of Development

Simon Willison's Blog·medium signal

Salvatore Sanfilippo (antirez) submitted a PR adding a new Array data type to Redis after four months of development. The type adds 18 commands (ARGET, ARSET, ARGREP, ARSCAN, etc.) where numerical index is a first-class semantic concept. Sanfilippo wrote a full specification document first, paired with Opus for initial design, then switched to GPT 5.3 + Codex for implementation. Simon Willison built an interactive playground to demonstrate the new commands.