Blob error on file upload with multipart data

[johanbook]

I am trying to execute the following

 const snippet = new HTTPSnippet({
 method: "POST",
 url: "http://mockbin.com/har",
 headers: [
 {
 name: "content-type",
 value: "multipart/form-data"
 }
 ],
 postData: {
 mimeType: "multipart/form-data",
 params: [
 {
 name: "foo",
 fileName: "test/fixtures/files/hello.txt",
 contentType: "text/plain"
 }
 ]
 }
 });

but gets

TypeError: Failed to execute 'append' on 'FormData': parameter 2 is not of type 'Blob'.

in

 110 | request.postData.params.forEach(function (param) {
> 111 | form.append(param.name, param.value || '', {
 | ^ 112 | filename: param.fileName || null,
 113 | contentType: param.contentType || null
 114 | })

Is there any error in my usage?

Can be related to #111

[darrenjennings]

Duplicate of #111