Modifying empty? method of errors

earlier
puts Benchmark.measure { p u.errors.empty? }
true
  0.000000   0.000000   0.000000 (  0.000085)

Now if rather than calling empty? we call  values.flatten.empty?
puts Benchmark.measure { p u.errors.values.flatten.empty? }
true
  0.000000   0.000000   0.000000 (  0.000036)