src/main/core-api/java/com/mysql/cj/util/TimeUtil.java [192:205]:
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    public static LocalDateTime adjustNanosPrecision(LocalDateTime x, int fsp, boolean serverRoundFracSecs) {
        if (fsp < 0 || fsp > 6) {
            throw ExceptionFactory.createException(WrongArgumentException.class, "fsp value must be in 0 to 6 range.");
        }
        int originalNano = x.getNano();
        double tail = Math.pow(10, 9 - fsp);

        int adjustedNano = serverRoundFracSecs ? (int) Math.round(originalNano / tail) * (int) tail : (int) (originalNano / tail) * (int) tail;
        if (adjustedNano > 999999999) { // if rounded up to the second then increment seconds
            adjustedNano %= 1000000000;
            x = x.plusSeconds(1);
        }
        return x.withNano(adjustedNano);
    }
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src/main/core-api/java/com/mysql/cj/util/TimeUtil.java [207:220]:
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    public static LocalTime adjustNanosPrecision(LocalTime x, int fsp, boolean serverRoundFracSecs) {
        if (fsp < 0 || fsp > 6) {
            throw ExceptionFactory.createException(WrongArgumentException.class, "fsp value must be in 0 to 6 range.");
        }
        int originalNano = x.getNano();
        double tail = Math.pow(10, 9 - fsp);

        int adjustedNano = serverRoundFracSecs ? (int) Math.round(originalNano / tail) * (int) tail : (int) (originalNano / tail) * (int) tail;
        if (adjustedNano > 999999999) { // if rounded up to the second then increment seconds
            adjustedNano %= 1000000000;
            x = x.plusSeconds(1);
        }
        return x.withNano(adjustedNano);
    }
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