fix: don't simplify type of serialized return

[danielroe]

🔗 Linked issue

nuxt/nuxt#19654

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

We are experiencing issue comparing routes triggered by #1002. This slightly decreases complexity but we really need to find a solution for this on larger projects. (And ideally to replicate regression locally in type fixture by, as a first step, enabling strict: true in nitro and increasing type complexity.)

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[codecov]

Codecov Report

Merging #1050 (62d028d) into main (21b2d65) will decrease coverage by 0.10%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1050      +/-   ##
==========================================
- Coverage   67.41%   67.32%   -0.10%     
==========================================
  Files          62       62              
  Lines        6286     6283       -3     
  Branches      707      706       -1     
==========================================
- Hits         4238     4230       -8     
- Misses       2034     2038       +4     
- Partials       14       15       +1     

Impacted Files	Coverage Δ
src/types/fetch.ts	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

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[pi0]

Thanks! Feel free to open a followup issue to assign :)