Host environment: Blob and File objects don't have the right string tag

Description

If I apply toString to a Blob or File object, the result is not [object Blob] or [object File] as one would expect, but [object Object].

This leads to issues for example using Axios, that uses this method to check if what gets passed to it as data is a particular type: https://github.com/axios/axios/blob/e9965bfafc82d8b42765705061b9ebe2d5532493/lib/utils.js#L148

As a workaround I put those two lines in index.js before everything else:

Blob.prototype[Symbol.toStringTag] = 'Blob'
File.prototype[Symbol.toStringTag] = 'File'

React Native version:

info Fetching system and libraries information...
System:
    OS: macOS 11.4
    CPU: (16) x64 Intel(R) Core(TM) i9-9980HK CPU @ 2.40GHz
    Memory: 19.95 MB / 32.00 GB
    Shell: 5.8 - /bin/zsh
  Binaries:
    Node: 14.16.1 - /usr/local/bin/node
    Yarn: 1.22.10 - ~/.npm/packages/bin/yarn
    npm: 6.14.12 - /usr/local/bin/npm
    Watchman: 4.9.0 - /usr/local/bin/watchman
  Managers:
    CocoaPods: 1.10.1 - /usr/local/bin/pod
  SDKs:
    iOS SDK: Not Found
    Android SDK:
      API Levels: 28, 29, 30
      Build Tools: 28.0.3, 29.0.2, 30.0.3
      System Images: android-22 | Google APIs Intel x86 Atom, android-29 | Intel x86 Atom_64, android-30 | Google APIs Intel x86 Atom
      Android NDK: Not Found
  IDEs:
    Android Studio: 4.1 AI-201.8743.12.41.7042882
    Xcode: /undefined - /usr/bin/xcodebuild
  Languages:
    Java: 1.8.0_282 - /usr/bin/javac
  npmPackages:
    @react-native-community/cli: Not Found
    react: 17.0.1 => 17.0.1 
    react-native: 0.64.2 => 0.64.2 
    react-native-macos: Not Found
  npmGlobalPackages:
    *react-native*: Not Found

Steps To Reproduce

Provide a detailed list of steps that reproduce the issue.

1. Render this in a component: toString.apply(new Blob())
2. It shows as [object Object]

Expected Results

The result should be [object Blob]

Snack, code example, screenshot, or link to a repository:

https://snack.expo.io/VdqTTyUBn

Works fine in Web, the error shows in Android.

Inizia con la riproduzione su Android nello Snack collegato e confronta il comportamento di Blob e File con il workaround mostrato in index.js. Il lavoro è completato quando l’applicazione di toString a un Blob produce [object Blob] e il controllo corrispondente di File produce [object File] su Android.