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Deno.copy
deprecatedCopies from src to dst until either EOF (null) is read from src or an error occurs. It resolves to the number of bytes copied or rejects with the first error encountered while copying.
@deprecated
Use copy from std/streams/conversion.ts instead. Deno.copy will be removed in the future.
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https://doc.deno.land/deno/stable/~/Deno.copy