Brandon questions

Brandon answers

• what is this operator called and what is it used for <=>
• Why does code need to be reloaded in Rails 3?
• How can I search for substring in a buffer that contains null?
• How to use conditionals in Gemfile
• what is the difference between exit and exit! in ruby?
• What does aspectj-weaver.jar do?
• Time.now.midnight's susceptibility to time zones
• after_create callback not working in test but works in console
• ActiveRecord, MySQL, and nested transactions -- what's the behavior?