Output error message when wrong error type is thrown

[cowwoc]

Version 4.11.0

When a test expects one error but another type gets thrown I get this kind of output:

# ArrayTest.isEmpty_actualContainsOneElement
not ok 1 should throw
  ---
    operator: throws
    expected: |-
      [Function: RangeError]
    actual: |-
      [Function: TypeError]
    at: Test.<anonymous> (C:\Users\Gili\Documents\requirements.js\build\test\ArrayTest.js:15:14)
  ...

Please output the message associated with the actual error because it contains useful hints of what went wrong.