Gem::SafeMarshal::Reader#read!

# File tmp/rubies/ruby-3.4.1/lib/rubygems/safe_marshal/reader.rb, line 33
def read!
  read_header
  root = read_element
  raise UnconsumedBytesError, "expected EOF, got #{@io.read(10).inspect}... after top-level element #{root.class}" unless @io.eof?
  root
end