Nitro v3 Binary Cache Corruption Repro

Minimal reproduction for nitrojs/nitro#3831.

Bug

defineCachedEventHandler corrupts binary responses because it uses res.text() to read the body before caching, converting binary data to UTF-8.

Repro

pnpm install
pnpm test

Expected output

00ff04050ac8962100ff

Actual output (corrupted)

00efbfbd04050ac89621

0xff bytes are replaced with efbfbd (UTF-8 replacement character).

Manual test

pnpm dev
curl -s http://localhost:3000/api/raw | xxd -p     # correct: 00ff04050ac8962100ff
curl -s http://localhost:3000/api/binary | xxd -p  # corrupted: 00efbfbd04050ac89621

Fix

See fix/patch branch for a pnpm patch that fixes the issue by using res.arrayBuffer() and base64 encoding for cache storage.