{{alias}}( str )
    Percent-encodes a UTF-16 encoded string according to RFC 3986.

    Parameters
    ----------
    str: string
        UTF-16 encoded string.

    Returns
    -------
    out: string
        Percent-encoded string.

    Examples
    --------
    > var out = {{alias}}( '☃' )
    '%E2%98%83'

    See Also
    --------