{{alias}}( [dtype] )
    Returns the alignment (in bytes) for a specified underlying array data type.

    If not provided a data type value, the function returns an object mapping
    data type strings to alignments (in bytes).

    If provided an unknown/unsupported data type, the function returns `null`.

    Parameters
    ----------
    dtype: any (optional)
        Data type value.

    Returns
    -------
    out: Object|number|null
        Alignment (in bytes).

    Examples
    --------
    > var out = {{alias}}( 'float64' )
    8
    > out = {{alias}}( 'foobar' )
    null
    > var obj = {{alias}}()
    {...}

    See Also
    --------