Prevent its(:to_i) from generated tests

[alexpop]

This is because the rspec-its dependency is not working properly for strings:

require 'rspec/its'

describe "655555" do
  its("size") { should be <= 4 }
  its(:size) { should be <= 4 }
  its(:to_i) { should be <= 4 }
  its("length") { should be <= 4 }
end

Expecting all tests to fail:

$ rspec

655555
  size
    should be <= 4
  size
    should be <= 4
  to_i
    should be <= 4
  length
    should be <= 4 (FAILED - 1)

Failures:

  1) 655555 length should be <= 4
     Failure/Error: its("length") { should be <= 4 }

       expected: <= 4
            got:    6
     # ./spec/unit/default_spec.rb:7:in `block (2 levels) in <top (required)>'

Finished in 0.01098 seconds (files took 0.08507 seconds to load)
4 examples, 1 failure

[arlimus]

Thank you @alexpop for working around this issue!

Let me be clear: I hate that we have to merge this in, as the underlying framework (afaics) produces this unexpected behavior. We'll have to reconsider some of its work 😁

Kudos Alex 👍