old_contents: var rescue = require('rescue')
  
  // We do not set the code by calling `process.exit` immediately. We instead set
  // set the exit code by hooking the exit event. This means that we're not going
  // to shutdown hard, so if our dear user fails to cancel timers and close
  // streams, shutdown is going to hang. That is what we want. A program know how
  // to able to stop it's own event loops.
  
  module.exports = function (process) {
      return function (error, exitCode) {
          if (error) {
              exitCode = rescue([
                  /^bigeasy.arguable#abend$/m, function () {
                      if (error.stderr) {
                          process.stderr.write(error.stderr)
                          process.stderr.write('\n')
                      }
                      return error.exitCode
                  },
                  /^bigeasy.arguable#help$/m, function () {
                      process.stdout.write(error.stdout)
                      process.stdout.write('\n')
                      return error.exitCode
                  }
  // TODO Where is exit?
              ])(error)
              if (exitCode == null) {
                  exitCode = 1
              }
          }
  // TODO We ignore this now. It is always set thorugh `program`.
          if (exitCode != null) {
              process.exitCode = exitCode
          }
      }
  }
  
new_contents: var rescue = require('rescue')
  
  // We do not set the code by calling `process.exit` immediately. We instead set
  // set the exit code by hooking the exit event. This means that we're not going
  // to shutdown hard, so if our dear user fails to cancel timers and close
  // streams, shutdown is going to hang. That is what we want. A program know how
  // to able to stop it's own event loops.
  
  module.exports = function (process) {
      return function (error, exitCode) {
          if (error) {
              exitCode = rescue([
                  /^bigeasy.arguable#abend$/m, function () {
                      if (error.stderr) {
                          process.stderr.write(error.stderr)
                          process.stderr.write('\n')
                      }
                      return error.exitCode
                  },
                  /^bigeasy.arguable#help$/m, function () {
                      process.stdout.write(error.stdout)
                      process.stdout.write('\n')
                      return error.exitCode
                  }
  // TODO Where is exit?
              ])(error)
              if (exitCode == null) {
                  exitCode = 1
              }
          }
  // TODO We ignore this now. It is always set thorugh `program`.
          if (exitCode != null && typeof exitCode == 'number') {
              process.exitCode = exitCode
          }
      }
  }
  
subject: Use exit code only if it is numeric.