GeodeticCalculator - Wrong azimuth calculation

When trying to compute a geodetic curve at the equator from east to west,
a wrong azimuth is calculated.

The problem seems to be in the (private) method "computeDirection":
If "dlon" (delta longitude) is < 0 a wrong calculation is done:
... Math.PI * (3 / 2) ...
(3 / 2) is computed as integer and then used with pi.

The whole computation must be performed with double precision!