[BUG] encodeBody: "manual" ignored, causing double compression

[Dzinlife]

Describe the bug

When using encodeBody: "manual" in Response, OpenNext ignores this option and still applies compression, causing double compression of pre-compressed content.

Steps to reproduce

const res = await env['r2_bucket'].get('file.gzip')

return new NextResponse(res.body, {
  headers: {
    "content-type": res.httpMetadata.contentType,
    "content-encoding": res.httpMetadata.contentEncoding,
  },
  encodeBody: "manual",
});

Expected behavior

Content should not be re-compressed when encodeBody: "manual" is set.

Actual:

OpenNext compresses the content anyway, corrupting already compressed data from R2/S3.

@opennextjs/cloudflare version

1.9.0

Wrangler version

4.40.2

next info output

Operating System:
  Platform: darwin
  Arch: arm64
  Version: Darwin Kernel Version 25.1.0: Fri Sep 19 19:14:26 PDT 2025; root:xnu-12377.40.77.505.1~4/RELEASE_ARM64_T6000
  Available memory (MB): 32768
  Available CPU cores: 10
Binaries:
  Node: 20.11.1
  npm: 10.2.4
  Yarn: 1.22.22
  pnpm: 9.15.0
Relevant Packages:
  next: 15.5.4
  eslint-config-next: 15.0.1
  react: 19.1.1
  react-dom: 19.1.1
  typescript: 5.8.3

Additional context

No response