err:          aggregate{errors.New("forbidden"), alwaysMatchingError{}},
			matchAgainst: errors.New("unauthorized"),
			expectMatch:  true,
		},
		{
			name:         "match via equality",
			err:          aggregate{errors.New("err"), someError{}},
			matchAgainst: someError{},
			expectMatch:  true,
		},
		{
			name:         "match via nested aggregate",