{{alias}}( [dtype] )
    Returns a list of ndarray data types to which a provided ndarray data type
    can be safely cast.

    If not provided an ndarray data type, the function returns a casting table.

    If provided an unrecognized ndarray data type, the function returns `null`.

    Parameters
    ----------
    dtype: string (optional)
        ndarray data type.

    Returns
    -------
    out: Object|Array<string>|null
        ndarray data types to which a data type can be safely cast.

    Examples
    --------
    > var out = {{alias}}( 'float32' )
    <Array>

    See Also
    --------