Gem::Package#limit_read

# File tmp/rubies/ruby-4.0.0/lib/rubygems/package.rb, line 736
def limit_read(io, name, limit)
  bytes = io.read(limit + 1)
  raise Gem::Package::FormatError, "#{name} is too big (over #{limit} bytes)" if bytes.size > limit
  bytes
end