Re: [w3c/FileAPI] Add readAsSharedArrayBuffer to FileReader (#73)

This is the wrong level at which to solve this problem. We should go around duplicating every API on the platform that produces ArrayBuffers to create a second parallel version that creates a SharedArrayBuffer. If nothing else, the cost of keeping all these APIs in sync is very high.

Instead, what you need is a feature (probably an ECMAScript-level feature) for creating a SharedArrayBuffer from a non-shared ArrayBuffer, without memory copies. (Presumably this would detach the original ArrayBuffer.)

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