{{alias}}( dtype )
    Returns the number of bytes per element provided an underlying array data
    type.

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

    Parameters
    ----------
    dtype: string
        Data type.

    Returns
    -------
    nbytes: integer|null
        Number of bytes per element.

    Examples
    --------
    > var nbytes = {{alias}}( 'float64' )
    8
    > nbytes = {{alias}}( 'generic' )
    null
    > nbytes = {{alias}}( 'foobar' )
    null

    See Also
    --------