Here are some examples implementing custom streams to load documents.

	fetch.js
		Example of loading document using fetch instead of from a file

	fetch-stream.js
		Example of using fetch to load a document progressively,
		using TRYLATER signaling.

	custom-stream.js
		More examples of custom streams:
		- using Node's synchronous file descriptor API.
		- using FileReaderSync on Blob or File objects in Web Worker contexts.