Is Zig's New Writer Unsafe?

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If we wanted to write a function that takes one of Zig's new *std.Io.Reader and write it to stdout, we might start with something like: fn output(r: *std.Io.Reader) !void { const stdout = std.fs.File.stdout(); var buffer: [???]u8 = undefined; var writer = stdout.writer(&buffer); _ = try r.stream(&writer.interface, .unlimited); try writer.interface.flush(); } But what should the size of buffer be?…

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