code: function handleFieldValue (value) {
        if (!(value instanceof Buffer || typeof value === 'string')) {
          if (is(value).a(Object)) {
            if (value instanceof fs.FileReadStream) {
              return value
            } else {
              return Unirest.serializers.json(value)
            }
          } else {
            return value.toString()
          }
        } else return value
      }
docs: Handles Multipart Value Processing
  
  @param {Mixed} value