Gem::SafeMarshal::Reader#read_bytes

# File tmp/rubies/ruby-3.4.1/lib/rubygems/safe_marshal/reader.rb, line 50
def read_bytes(n)
  raise NegativeLengthError if n < 0
  str = @io.read(n)
  raise EOFError, "expected #{n} bytes, got EOF" if str.nil?
  raise DataTooShortError, "expected #{n} bytes, got #{str.inspect}" unless str.bytesize == n
  str
end