UriImageSource caching not implemented for Windows & check TODO comments around caching in general #9138

		async Task<Stream> GetStreamAsync(Uri uri, CancellationToken cancellationToken = default(CancellationToken))
		{
			cancellationToken.ThrowIfCancellationRequested();

			Stream stream = null;

			if (CachingEnabled)
			{
				// TODO: CACHING https://github.com/dotnet/runtime/issues/52332

				// var key = GetKey();
				// var cached = TryGetFromCache(key, out stream)
				if (stream is null)
					stream = await DownloadStreamAsync(uri, cancellationToken).ConfigureAwait(false);
				// if (!cached)
				//    Cache(key, stream)
			}
			else
			{
				stream = await DownloadStreamAsync(uri, cancellationToken).ConfigureAwait(false);
			}

			return stream;
		}