{{alias}}( value )
    Returns the enumeration constant associated with a supported BLAS diagonal
    type value.

    Downstream consumers of this function should *not* rely on specific integer
    values (e.g., `UNIT == 0`). Instead, the function should be used in an
    opaque manner.

    Parameters
    ----------
    value: any
        Diagonal type value.

    Returns
    -------
    out: integer|null
        Enumeration constant.

    Examples
    --------
    > var out = {{alias}}( 'non-unit' )
    <number>
    > out = {{alias}}( {{alias:@stdlib/blas/base/diagonal-type-str2enum}}( 'non-unit' ) )
    <number>

    See Also
    --------