{{alias}}( dtypes )
    Returns a data type that results from applying promotion rules to a provided
    list of data types.

    The function returns `null` if provided data types which cannot be safely
    cast to a promoted data type.

    Parameters
    ----------
    dtypes: Array<string>
        List of data types.

    Returns
    -------
    out: string|null
        Result.

    Examples
    --------
    > var dt = {{alias}}( [ 'float32', 'float64' ] )
    'float64'
    > dt = {{alias}}( [ 'binary', 'complex128' ] )
    null

    See Also
    --------