Ruby 2.3 write UTF-16LE gzip file

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I have this code, running with Ruby 2.3.1:

str = "麦克风访问被拒绝"
puts str.encoding #=> "UTF-8"

conv = Encoding::Converter.new("UTF-8", "UTF-16LE")
str = conv.convert(str)
puts str.encoding #=> "UTF-16LE"

Zlib::GzipWriter.open("test.gz", encoding: "UTF-16LE") do |gz|
  puts str.encoding #=> "UTF-16LE"
  gz.write(str)
end

Zlib::GzipReader.open("test.gz") do |gz|
  puts gz.read.encoding #=> ASCII-8BIT
  gz.read
end

and returns [Invalid encoding]

How can I save file in a way that it keeps the encoding as UTF-16LE?

asked 25 secs ago

Eduard

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Ruby 2.3 write UTF-16LE gzip file