PDF::Core::Stream has wrong length for multi-byte string

[sled]

I discovered, that PDF::Core::Stream#length returns the wrong length if a multi-byte string is used, i.e:

content = <<~XMP
  <?xpacket begin="\u{FEFF}" id="W5M0MpCehiHzreSzNTczkc9d"?>
  <?xpacket end="w"?>
XMP

puts "CONTENT BYTESIZE: #{content.bytesize}"

stream_1 = PDF::Core::Stream.new
stream_1 << content
puts "STREAM LENGTH #1: #{stream_1.length} << WRONG"

stream_2 = PDF::Core::Stream.new
stream_2 << content.force_encoding('BINARY')
puts "STREAM LENGTH #2: #{stream_2.length}"

outputs:

CONTENT BYTESIZE: 74
STREAM LENGTH #1: 72 << WRONG
STREAM LENGTH #2: 74

I think this line in PDF::Core::Stream#length should use String#bytesize instead of String#length