Inngest's instanceof lies: why custom error classes vanish across step.run

A small bug that will silently break your retry logic, your error reporting, and your dashboards. We run a long pipeline through Inngest — voice generation that calls OpenAI, then ElevenLabs, then writes to storage, with a consent gate at the top. Each vendor call lives in its own step.run so a transient failure on one vendor doesn't replay the rest of the pipeline. We classify failures with custom error classes: export class TTSUpstreamError extends Error { constructor ( public status : number