{{alias}}( iter0, iter1, iter2, fcn[, options] )
    Returns an iterator which invokes a ternary function accepting numeric
    arguments for each iterated value.

    When invoked, the input function is provided three arguments:

    - x: iterated value from first input iterator
    - y: iterated value from second input iterator
    - z: iterated value from third input iterator

    The length of the returned iterator is equal to the length of the shortest
    provided iterator. In other words, the returned iterator ends once *one* of
    the provided iterators ends.

    If provided a numeric value as an iterator argument, the value is broadcast
    as an infinite iterator which always returns the provided value.

    If an environment supports Symbol.iterator and provided iterators are
    iterable, the returned iterator is iterable.

    Parameters
    ----------
    iter0: Object
        First input iterator.

    iter1: Object
        Second input iterator.

    iter2: Object
        Third input iterator.

    fcn: Function
        Function to invoke for each iterated value.

    options: Object (optional)
        Options.

    options.invalid: any (optional)
        Return value when an input iterator yields a non-numeric value. Default:
        NaN.

    Returns
    -------
    iterator: Object
        Iterator.

    iterator.next(): Function
        Returns an iterator protocol-compliant object containing the next
        iterated value (if one exists) and a boolean flag indicating whether the
        iterator is finished.

    iterator.return( [value] ): Function
        Finishes an iterator and returns a provided value.

    Examples
    --------
    > var it0 = {{alias:@stdlib/random/iter/uniform}}( 0.0, 10.0 );
    > var it1 = {{alias:@stdlib/random/iter/uniform}}( 0.0, 1.0 );
    > var it2 = {{alias:@stdlib/random/iter/uniform}}( 9.0, 10.0 );
    > var it = {{alias}}( it0, it1, it2, {{alias:@stdlib/math/base/special/clamp}} );
    > var r = it.next().value
    <number>
    > r = it.next().value
    <number>

    See Also
    --------