
{{alias}}( str, len, seq )
    Truncates the middle UTF-16 code units of a string to return a string
    having a specified length.

    Parameters
    ----------
    str: string
        Input string.

    len: integer
        Output string length.

    seq: string
        Custom replacement sequence.

    Returns
    -------
    out: string
        Truncated string.

    Examples
    --------
    > var str = 'beep boop';
    > var out = {{alias}}( str, 5, '...' )
    'b...p'
    > out = {{alias}}( str, 5, '|' )
    'be|op'

    See Also
    --------
