Re: [w3c/FileAPI] Reslove Blob to an existing ArrayBuffer (#143)

AFAIK, currently there's no such way of resolving Blob to an existing ArrayBuffer(Or I am happy to be wrong).

If I use WebAssembly, and I want to read the content of a file, I need to first call File.ArrayBuffer to resolve the large content to a newly-created ArrayBuffer, and then copy it to the WASM memory. This means double writes.

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