{{alias}}
    Concat spreadable symbol.

    This symbol specifies whether an array-like object should be flattened to
    its elements during concatenation.

    The symbol is only supported in ES6/ES2015+ environments. For non-supporting
    environments, the value is `null`.

    Examples
    --------
    > var s = {{alias}}
    e.g., <symbol>

    See Also
    --------