Works around Rubinius bug
rbx build is green; let us try to keep it that way
Add missing 2.13.1 release notes.

[ci skip]
Add spec documenting the fact that null-ness doesn't persist between examples.
Revert "rbx build is green; let us try to keep it that way"

This reverts commit 8d6eb5d2e527832f91e747863fcff32bc378d40f.
Merge pull request #355 from rspec/add_spec_for_nullness_not_persisting

Add spec documenting the fact that null-ness doesn't persist between exa...
Update changelog with 2.14.1 release notes.

[ci skip]
ensure null objects behave correctly with to_a and to_ary
1.8.7 has a default implementation on top
more descriptive comment
refactor to case statement
Merge pull request #358 from rspec/revisited_bugfix_for_doubles_in_arrays

Ensure null objects behave correctly with to_a and to_ary