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related issue: #160
did a performance test, it seems no big performance impact use BigDecimal to do the comparison, to use BigDecimal comparison will reduce a lot of defects.
tested with comparing with "1E39", "-1000" 200000 times after change. The average time is
2312ms
tested with comparing with "1000.1", "1000" 200000 times before change. The average time is 2326.8ms