Bug Description

Not getting the full type when parsing multipart/form-data

Reproducible By

var b = new Blob(['123'], { type: 'text/plain;charset=utf-8'})
var fd = new FormData()
fd.set('x', b)
var res = new Response(fd)
res.clone().text().then(body => 
  // Just making sure that it contains ;charset=utf-8 (which it dose)
  console.log(body.includes('utf-8'))
)

new Response(fd).formData().then(fd => {
  // returns just 'text/plain'
  console.log(fd.get('x').type)
})

Expected Behavior

To get the full type, text/plain;charset=utf-8

Logs & Screenshots

Screenshot of chrome:

Screenshot of NodeJS

Environment

Not using undici directly - using Node.js v20.6.1 built in fetch

Additional context

presumable this revolves around the usage around Busboy...
Maybe the type should be extracted from the headers instead...? to get the raw content-type.