code: function _gpfAssertImpl (condition, message) {
      if (undefined === message) {
          _gpfAssertImpl(false, "Assertion with no message");
      }
      _gpfAssertFailIfConditionFalsy(condition, message);
  }
docs: Assertion helper
  
  @param {Boolean} condition Truthy / [Falsy](https://developer.mozilla.org/en-US/docs/Glossary/Falsy) value
  @param {String} message Assertion message explaining the violation when the condition is false
  @throws {gpf.Error.AssertionFailed}
  @since 0.1.5