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What’s the default responseStrategy for executeJs in v8?
The behavior matches v7. When you omit responseStrategy, the SDK calls processLitActionResponseStrategy with { strategy: 'leastCommon' }. If you provide an unrecognized value, the helper still falls back to leastCommon.
This default keeps compatibility with Lit.Actions.runOnce. Only the node that runs the runOnce block returns a value, so selecting the least-common response ensures that single result is preserved. When runOnce is not used, all nodes should emit the same payload, making least- vs most-common equivalent—the former stayed in place because it was the quickest path to enabling the new runOnce flow in v8. 
