# Chrome 156 (Mozilla/5.0 (X11; Linux x86_64) ... Chrome/156.0.0.0), evaluated in a page:
#   const t = "a\n".repeat(2000).slice(0, 3999); const fd = new FormData(); fd.append("text", t);
#   const body = await new Response(fd).text();  // value bytes between the part headers and the closing boundary
{"clientLength":3999,"wireLength":5998,"crlf":1999}