Psych::Parser#skip_io_bom

# File tmp/rubies/ruby-4.1.0-preview1/ext/psych/lib/psych/parser.rb, line 94
def skip_io_bom io, bom
  begin
    pos = io.pos
  rescue SystemCallError, IOError
    return # Not seekable; nothing has been consumed yet.
  end
  head = io.read(bom.bytesize)
  io.seek(pos, IO::SEEK_SET) if head && head.b != bom
end