Another issue caught by CodeRabbit:

Promises inside arrays are silently skipped by _iterate.

When property.constructor === Array (line 360), property.forEach(_iterate) passes each array element to _iterate as prop. For a Promise element, Object.keys(prop) returns [] (Promises have no enumerable own properties), so the inner forEach at line 355 never executes — the instanceof Promise check at line 362 is never reached for that element.

This differs from resolveDeferredConfigs (lines 311–318), which explicitly checks if (entry instanceof DeferredConfig) within array iteration, demonstrating the correct pattern.

Additionally, Promise.all(promises) at line 371 awaits the promises but doesn't write resolved values back into the config object.