Change TRUNC implementation to use MathX #193
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The TRUNC implementation is still broken. (BUG: https://bz.apache.org/bugzilla/show_bug.cgi?id=62506 )
The main argument against the proposed fix in 62506 was the performance hit of using BigDecimal for every round() operation. Since the round() methods now use MathX methods which construct a BigDecimal from the Excel string, the TRUNC function can be fixed by using the MathX.roundDown() method.