fix: address memory leak when using Blob for downloads #354
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PekingSpades
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ref: #353
Memory is already copied when the Blob is created, so it's safe to release the
chunks. when a download is triggered, it's safe to useURL.revokeObjectURL. if the browser needs the user to confirm the download for some reason, such as needing the user to confirm the download of a file that came from HTTP, the browser itself will hold a memory copy, so there's no need to worry about the side effect of releasing it. .