[pi0x]

Adds a features.fastResponse flag that replaces the global Response with srvx FastResponse, so new Response() in user code skips the native Response overhead on Node.js.

• Defaults to the node option (enabled for Node.js based presets, disabled for workers).
• Implemented as a polyfill (#nitro/runtime/polyfills/fast-response) added to the build env before user polyfills, so it applies to prod entries, dev and prerender.
• instanceof Response keeps working for both native and fast responses.
• No-op on Bun, Deno and the standard preset, where srvx FastResponse is the native Response.

Set features: { fastResponse: false } to opt out.

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[vercel]

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Project	Deployment	Actions	Updated
nitro.build	Ready	Preview	Oct 23, 2026 5:18am UTC

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📒 Files selected for processing: 8

• docs/3.config/0.index.md
• src/build/env.ts
• src/runtime/internal/polyfills/fast-response.ts
• src/types/config.ts
• test/fixture/server/routes/fast-response.ts
• test/presets/vercel.test.ts
• test/tests.ts
• test/unit/build-env.test.ts

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commit: 9271d4f