While trying out the Wasm compiler, I noticed that the syscall/js mainly 
has helper functions for converting Go types to Js types, but not the other 
way around.   I am trying to read the data from an HTML <input 
type="file"/>.  I add an event listener for the `change` event and want to 
read the file contents.   The problem is that there doesn't seem to be a 
way to convert between any dataformat window.FileReader (such as 
ArrayBuffer, or a UInt8Array), and a []byte.   My work around for now is 
calling js.Value.String(), and parsing the comma separated decimal numbers.

What is the correct way to do this?    

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