Type alias BuiltinReducer

Named built-in reducer strategies for GraphState.scratch and GraphState.artifacts fields.

• concat — append arrays or concatenate strings.
• merge — deep-merge objects (right wins on conflict).
• max — keep the larger numeric value.
• min — keep the smaller numeric value.
• avg — running arithmetic mean.
• sum — running total.
• last — always overwrite with the latest value (default semantics).
• first — keep the first value; ignore subsequent writes.
• longest — keep the longer string or larger array.