Returns the nth element in the container's 'natural' order.
| nth-element < array > < number > |
| nth-element < array-container > < integer > |
| nth-element < iteratable-container-mixin > < integer > |
| nth-element < list > < integer > |
| nth-element < list-container > < integer > |
| nth-element :around < t > < integer > |
| nth-element < vector > < number > |
| nth-element < vector-container-mixin > < integer > |