These methods have changed in Ruby 2.5 to be more akin to grep:
https://bugs.ruby-lang.org/issues/11286
Using classes seems to be faster (and a bit more expressive) than iterating over
the collection items:
```
Warming up --------------------------------------
#all? with class 504.000 i/100ms
#all? with proc 189.000 i/100ms
Calculating -------------------------------------
#all? with class 4.960k (± 1.6%) i/s - 25.200k in 5.082049s
#all? with proc 1.874k (± 2.8%) i/s - 9.450k in 5.047866s
Comparison:
#all? with class: 4959.9 i/s
#all? with proc: 1873.8 i/s - 2.65x (± 0.00) slower
```
Benchmark script:
```ruby
require "minitest/autorun"
require "benchmark/ips"
class BugTest < Minitest::Test
def test_enumerators_with_classes
arr = (1..10000).to_a << nil
assert_equal arr.all?(Integer), arr.all? { |v| v.is_a?(Integer) }
Benchmark.ips do |x|
x.report("#all? with class") do
arr.all?(Integer)
end
x.report("#all? with proc") do
arr.all? { |v| v.is_a?(Integer) }
end
x.compare!
end
end
end
```
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