Multipart body parser issue

[alkan]

deno v1.13.2, servest v1.3.4

const form = await req.formData()
const file = form.file('myfile')

In such a simple script, it is expected that 'file' object should xe an array instance with a few extra prorerties. We, however, got a plain object wich 4 propertios belong to file metadata. The body_parser_test.ts unit test file fails due to isArray() assention, naturally.

Additionally, req.formData() operation takes 4500-4700 ms for a 23k file upload which is not reasonable I ,think.