divide with DecimalMode decimalPrecision = 0 returns zero

[ericksli]

Describe the bug

I tried to do a division and set the DecimalMode with scale and roundingMode but found out that the result is zero which scale is for the exponent of the scientific notation. If I set the decimalPrecision to a larger number then I can get the correct result.

To Reproduce

import com.ionspin.kotlin.bignum.decimal.DecimalMode
import com.ionspin.kotlin.bignum.decimal.RoundingMode
import com.ionspin.kotlin.bignum.decimal.toBigDecimal
import io.kotest.matchers.shouldBe
import org.junit.jupiter.api.Test
import java.math.BigDecimal

class BigDecimalTest {
    @Test
    fun kmp1() {
        "460.0".toBigDecimal().divide(
            other = 40.toBigDecimal(),
            decimalMode = DecimalMode(scale = 2, roundingMode = RoundingMode.FLOOR),
        ).shouldBe("11.5".toBigDecimal()) // Fail
        // Expected :1.15E+1
        // Actual   :0.0E+2
    }

    @Test
    fun kmp2() {
        "460.0".toBigDecimal().divide(
            other = 40.toBigDecimal(),
            decimalMode = DecimalMode(decimalPrecision = 6, scale = 2, roundingMode = RoundingMode.FLOOR),
        ).shouldBe("11.5".toBigDecimal()) // Pass
    }

    @Test
    fun java() {
        BigDecimal("460.0").divide(BigDecimal("40"), 2, java.math.RoundingMode.FLOOR)
            .shouldBe(BigDecimal("11.50")) // Pass
    }
}

Expected behavior

Return value should not be zero if the actual result is not zero even decimalPrecision = 0 and the scale should be the number of decimal places of the result.

Platform

• JVM OpenJDK Runtime Environment Microsoft-7626293 (build 17.0.7+7-LTS)

Additional context
Nil.

[ionspin]

Thanks for reporting, we're working on improvements in division/rounding code and we'll make sure to include this issue into the test set.