{{alias}}( x )
    Computes the principal square root of `1+x` minus one.

    This function is more accurate than the obvious approach for small `x`.

    Parameters
    ----------
    x: number
        Input value.

    Returns
    -------
    y: number
        Square root of `1+x` minus one.

    Examples
    --------
    > var y = {{alias}}( 3.0 )
    1.0
    > y = {{alias}}( 0.5 )
    ~0.225
    > y = {{alias}}( 0.02 )
    ~0.01
    > y = {{alias}}( -0.5 )
    ~-0.293
    > y = {{alias}}( -1.1 )
    NaN
    > y = {{alias}}( NaN )
    NaN

    See Also
    --------