diff --git a/examples/build.gradle.kts b/examples/build.gradle.kts
index d02e5268e..29aa1af6e 100644
--- a/examples/build.gradle.kts
+++ b/examples/build.gradle.kts
@@ -103,6 +103,14 @@ benchmark {
         iterationTimeUnit = "ms" // time unity for iterationTime, default is seconds
         include("MatrixInverseBenchmark")
     }
+
+    configurations.register("bigInt") {
+        warmups = 1 // number of warmup iterations
+        iterations = 3 // number of iterations
+        iterationTime = 500 // time in seconds per iteration
+        iterationTimeUnit = "ms" // time unity for iterationTime, default is seconds
+        include("BigIntBenchmark")
+    }
 }
 
 kotlin.sourceSets.all {
diff --git a/examples/src/benchmarks/kotlin/space/kscience/kmath/benchmarks/BigIntBenchmark.kt b/examples/src/benchmarks/kotlin/space/kscience/kmath/benchmarks/BigIntBenchmark.kt
new file mode 100644
index 000000000..543d51bee
--- /dev/null
+++ b/examples/src/benchmarks/kotlin/space/kscience/kmath/benchmarks/BigIntBenchmark.kt
@@ -0,0 +1,32 @@
+package space.kscience.kmath.benchmarks
+
+import kotlinx.benchmark.Blackhole
+import org.openjdk.jmh.annotations.Benchmark
+import org.openjdk.jmh.annotations.Scope
+import org.openjdk.jmh.annotations.State
+import space.kscience.kmath.operations.BigIntField
+import space.kscience.kmath.operations.JBigIntegerField
+import space.kscience.kmath.operations.invoke
+
+@State(Scope.Benchmark)
+internal class BigIntBenchmark {
+    @Benchmark
+    fun kmAdd(blackhole: Blackhole) = BigIntField{
+        blackhole.consume(one + number(Int.MAX_VALUE))
+    }
+
+    @Benchmark
+    fun jvmAdd(blackhole: Blackhole) = JBigIntegerField{
+        blackhole.consume(one + number(Int.MAX_VALUE))
+    }
+
+    @Benchmark
+    fun kmMultiply(blackhole: Blackhole) = BigIntField{
+        blackhole.consume(number(Int.MAX_VALUE)* number(Int.MAX_VALUE))
+    }
+
+    @Benchmark
+    fun jvmMultiply(blackhole: Blackhole) = JBigIntegerField{
+        blackhole.consume(number(Int.MAX_VALUE)* number(Int.MAX_VALUE))
+    }
+}
\ No newline at end of file
diff --git a/kmath-commons/src/main/kotlin/space/kscience/kmath/commons/linear/CMMatrix.kt b/kmath-commons/src/main/kotlin/space/kscience/kmath/commons/linear/CMMatrix.kt
index 80929e6b9..99219c19f 100644
--- a/kmath-commons/src/main/kotlin/space/kscience/kmath/commons/linear/CMMatrix.kt
+++ b/kmath-commons/src/main/kotlin/space/kscience/kmath/commons/linear/CMMatrix.kt
@@ -9,14 +9,14 @@ import space.kscience.kmath.structures.DoubleBuffer
 import kotlin.reflect.KClass
 import kotlin.reflect.cast
 
-public inline class CMMatrix(public val origin: RealMatrix) : Matrix<Double> {
+public class CMMatrix(public val origin: RealMatrix) : Matrix<Double> {
     public override val rowNum: Int get() = origin.rowDimension
     public override val colNum: Int get() = origin.columnDimension
 
     public override operator fun get(i: Int, j: Int): Double = origin.getEntry(i, j)
 }
 
-public inline class CMVector(public val origin: RealVector) : Point<Double> {
+public class CMVector(public val origin: RealVector) : Point<Double> {
     public override val size: Int get() = origin.dimension
 
     public override operator fun get(index: Int): Double = origin.getEntry(index)
diff --git a/kmath-core/src/commonTest/kotlin/space/kscience/kmath/structures/NumberNDFieldTest.kt b/kmath-core/src/commonTest/kotlin/space/kscience/kmath/structures/NumberNDFieldTest.kt
index 376415a56..01fde190f 100644
--- a/kmath-core/src/commonTest/kotlin/space/kscience/kmath/structures/NumberNDFieldTest.kt
+++ b/kmath-core/src/commonTest/kotlin/space/kscience/kmath/structures/NumberNDFieldTest.kt
@@ -70,7 +70,7 @@ class NumberNDFieldTest {
 
     object L2Norm : Norm<StructureND<out Number>, Double> {
         override fun norm(arg: StructureND<out Number>): Double =
-            kotlin.math.sqrt(arg.elements().sumByDouble { it.second.toDouble() })
+            kotlin.math.sqrt(arg.elements().sumOf { it.second.toDouble() })
     }
 
     @Test
diff --git a/kmath-ejml/src/main/kotlin/space/kscience/kmath/ejml/EjmlMatrix.kt b/kmath-ejml/src/main/kotlin/space/kscience/kmath/ejml/EjmlMatrix.kt
index 10afd6ec2..30b6dc2ee 100644
--- a/kmath-ejml/src/main/kotlin/space/kscience/kmath/ejml/EjmlMatrix.kt
+++ b/kmath-ejml/src/main/kotlin/space/kscience/kmath/ejml/EjmlMatrix.kt
@@ -9,7 +9,7 @@ import space.kscience.kmath.linear.Matrix
  * @property origin the underlying [SimpleMatrix].
  * @author Iaroslav Postovalov
  */
-public inline class EjmlMatrix(public val origin: SimpleMatrix) : Matrix<Double> {
+public class EjmlMatrix(public val origin: SimpleMatrix) : Matrix<Double> {
     public override val rowNum: Int get() = origin.numRows()
     public override val colNum: Int get() = origin.numCols()
 
diff --git a/kmath-functions/src/commonMain/kotlin/space/kscience/kmath/integration/GaussIntegrator.kt b/kmath-functions/src/commonMain/kotlin/space/kscience/kmath/integration/GaussIntegrator.kt
index a4f79f542..9a950e05e 100644
--- a/kmath-functions/src/commonMain/kotlin/space/kscience/kmath/integration/GaussIntegrator.kt
+++ b/kmath-functions/src/commonMain/kotlin/space/kscience/kmath/integration/GaussIntegrator.kt
@@ -31,7 +31,7 @@ public class GaussIntegrator<T : Comparable<T>> internal constructor(
 
     init {
         require(points.size == weights.size) { "Inconsistent points and weights sizes" }
-        require(points.indices.all { i -> i == 0 || points[i] > points[i - 1] }){"Integration nodes must be sorted"}
+        require(points.indices.all { i -> i == 0 || points[i] > points[i - 1] }) { "Integration nodes must be sorted" }
     }
 
     override fun integrate(integrand: UnivariateIntegrand<T>): UnivariateIntegrand<T> = with(algebra) {
@@ -51,6 +51,9 @@ public class GaussIntegrator<T : Comparable<T>> internal constructor(
 
     public companion object {
 
+        /**
+         * Integrate given [function] in a [range] with Gauss-Legendre quadrature with [numPoints] points.
+         */
         public fun integrate(
             range: ClosedRange<Double>,
             numPoints: Int = 100,
@@ -63,5 +66,20 @@ public class GaussIntegrator<T : Comparable<T>> internal constructor(
                 UnivariateIntegrand(function, IntegrationRange(range))
             )
         }
+
+//        public fun integrate(
+//            borders: List<Double>,
+//            numPoints: Int = 10,
+//            ruleFactory: GaussIntegratorRuleFactory<Double> = GaussLegendreDoubleRuleFactory,
+//            features: List<IntegrandFeature> = emptyList(),
+//            function: (Double) -> Double,
+//        ): UnivariateIntegrand<Double> {
+//            require(borders.indices.all { i -> i == 0 || borders[i] > borders[i - 1] }){"Borders are not sorted"}
+//
+//            val (points, weights) = ruleFactory.build(numPoints, range)
+//            return GaussIntegrator(DoubleField, points, weights).integrate(
+//                UnivariateIntegrand(function, IntegrationRange(range))
+//            )
+//        }
     }
 }
\ No newline at end of file
diff --git a/kmath-functions/src/commonMain/kotlin/space/kscience/kmath/integration/GaussIntegratorRuleFactory.kt b/kmath-functions/src/commonMain/kotlin/space/kscience/kmath/integration/GaussIntegratorRuleFactory.kt
index 678e6bf0a..be7e298af 100644
--- a/kmath-functions/src/commonMain/kotlin/space/kscience/kmath/integration/GaussIntegratorRuleFactory.kt
+++ b/kmath-functions/src/commonMain/kotlin/space/kscience/kmath/integration/GaussIntegratorRuleFactory.kt
@@ -10,6 +10,7 @@ import kotlin.native.concurrent.ThreadLocal
 public interface GaussIntegratorRuleFactory<T : Any> {
     public val algebra: Field<T>
     public val bufferFactory: BufferFactory<T>
+
     public fun build(numPoints: Int): Pair<Buffer<T>, Buffer<T>>
 
     public companion object {
@@ -20,6 +21,7 @@ public interface GaussIntegratorRuleFactory<T : Any> {
 
 /**
  * Create an integration rule by scaling existing normalized rule
+ *
  */
 public fun <T : Comparable<T>> GaussIntegratorRuleFactory<T>.build(
     numPoints: Int,
@@ -45,8 +47,8 @@ public fun <T : Comparable<T>> GaussIntegratorRuleFactory<T>.build(
 /**
  * Gauss integrator rule based ont Legendre polynomials. All rules are normalized to
  *
- * The code is based on Apache Commons Math source code version 3.6.1
- * https://commons.apache.org/proper/commons-math/javadocs/api-3.6.1/org/apache/commons/math3/analysis/integration/gauss/LegendreRuleFactory.html
+ * The code is based on [Apache Commons Math source code version 3.6.1](https://commons.apache.org/proper/commons-math/javadocs/api-3.6.1/org/apache/commons/math3/analysis/integration/gauss/LegendreRuleFactory.html)
+ *
  */
 @ThreadLocal
 public object GaussLegendreDoubleRuleFactory : GaussIntegratorRuleFactory<Double> {
@@ -96,12 +98,12 @@ public object GaussLegendreDoubleRuleFactory : GaussIntegratorRuleFactory<Double
             // P[j](b)
             var pb = b
             for (j in 1 until numPoints) {
-                val two_j_p_1 = 2 * j + 1
-                val j_p_1 = j + 1
+                val twoJP1 = 2 * j + 1
+                val jP1 = j + 1
                 // P[j+1](a)
-                val ppa = (two_j_p_1 * a * pa - j * pma) / j_p_1
+                val ppa = (twoJP1 * a * pa - j * pma) / jP1
                 // P[j+1](b)
-                val ppb = (two_j_p_1 * b * pb - j * pmb) / j_p_1
+                val ppb = (twoJP1 * b * pb - j * pmb) / jP1
                 pma = pa
                 pa = ppa
                 pmb = pb
@@ -129,11 +131,8 @@ public object GaussLegendreDoubleRuleFactory : GaussIntegratorRuleFactory<Double
                 if (!done) {
                     if (pa * pc <= 0) {
                         b = c
-                        pmb = pmc
-                        pb = pc
                     } else {
                         a = c
-                        pma = pmc
                         pa = pc
                     }
                     c = 0.5 * (a + b)
@@ -147,7 +146,7 @@ public object GaussLegendreDoubleRuleFactory : GaussIntegratorRuleFactory<Double
             points[idx] = -c
             weights[idx] = w
         }
-        // If "numberOfPoints" is odd, 0 is a root.
+        // If "numPoints" is odd, 0 is a root.
         // Note: as written, the test for oddness will work for negative
         // integers too (although it is not necessary here), preventing
         // a FindBugs warning.
diff --git a/kmath-histograms/src/commonTest/kotlin/space/kscience/kmath/histogram/MultivariateHistogramTest.kt b/kmath-histograms/src/commonTest/kotlin/space/kscience/kmath/histogram/MultivariateHistogramTest.kt
index feb87a7a7..b4a30e2d2 100644
--- a/kmath-histograms/src/commonTest/kotlin/space/kscience/kmath/histogram/MultivariateHistogramTest.kt
+++ b/kmath-histograms/src/commonTest/kotlin/space/kscience/kmath/histogram/MultivariateHistogramTest.kt
@@ -38,7 +38,7 @@ internal class MultivariateHistogramTest {
                 put(nextDouble(), nextDouble(), nextDouble())
             }
         }
-        assertEquals(n, histogram.bins.sumBy { it.value.toInt() })
+        assertEquals(n, histogram.bins.sumOf { it.value.toInt() })
     }
 
     @Test
diff --git a/kmath-stat/src/commonMain/kotlin/space/kscience/kmath/internal/InternalGamma.kt b/kmath-stat/src/commonMain/kotlin/space/kscience/kmath/internal/InternalGamma.kt
index 96f5c66db..39f3ef0c7 100644
--- a/kmath-stat/src/commonMain/kotlin/space/kscience/kmath/internal/InternalGamma.kt
+++ b/kmath-stat/src/commonMain/kotlin/space/kscience/kmath/internal/InternalGamma.kt
@@ -163,7 +163,7 @@ internal object InternalGamma {
     }
 
     private fun lanczos(x: Double): Double =
-        (LANCZOS.size - 1 downTo 1).sumByDouble { LANCZOS[it] / (x + it) } + LANCZOS[0]
+        (LANCZOS.size - 1 downTo 1).sumOf { LANCZOS[it] / (x + it) } + LANCZOS[0]
 
     private fun invGamma1pm1(x: Double): Double {
         require(x >= -0.5)
diff --git a/kmath-stat/src/commonMain/kotlin/space/kscience/kmath/internal/InternalUtils.kt b/kmath-stat/src/commonMain/kotlin/space/kscience/kmath/internal/InternalUtils.kt
index 832689b27..b0e4ae9f3 100644
--- a/kmath-stat/src/commonMain/kotlin/space/kscience/kmath/internal/InternalUtils.kt
+++ b/kmath-stat/src/commonMain/kotlin/space/kscience/kmath/internal/InternalUtils.kt
@@ -21,7 +21,7 @@ internal object InternalUtils {
     fun validateProbabilities(probabilities: DoubleArray?): Double {
         require(!(probabilities == null || probabilities.isEmpty())) { "Probabilities must not be empty." }
 
-        val sumProb = probabilities.sumByDouble { prob ->
+        val sumProb = probabilities.sumOf { prob ->
             require(!(prob < 0 || prob.isInfinite() || prob.isNaN())) { "Invalid probability: $prob" }
             prob
         }
diff --git a/kmath-stat/src/commonMain/kotlin/space/kscience/kmath/optimization/NoDerivFunctionOptimization.kt b/kmath-stat/src/commonMain/kotlin/space/kscience/kmath/optimization/NoDerivFunctionOptimization.kt
index b8785dd8c..b2ff5aef4 100644
--- a/kmath-stat/src/commonMain/kotlin/space/kscience/kmath/optimization/NoDerivFunctionOptimization.kt
+++ b/kmath-stat/src/commonMain/kotlin/space/kscience/kmath/optimization/NoDerivFunctionOptimization.kt
@@ -40,7 +40,7 @@ public interface NoDerivFunctionOptimization<T : Any> : Optimization<T> {
             require(y.size == yErr.size) { "Y and yErr buffer should of the same size" }
 
             return Expression { arguments ->
-                x.indices.sumByDouble {
+                x.indices.sumOf {
                     val xValue = x[it]
                     val yValue = y[it]
                     val yErrValue = yErr[it]
diff --git a/kmath-stat/src/jvmMain/kotlin/space/kscience/kmath/stat/RandomSourceGenerator.kt b/kmath-stat/src/jvmMain/kotlin/space/kscience/kmath/stat/RandomSourceGenerator.kt
index f6a5d6605..d72f82ffd 100644
--- a/kmath-stat/src/jvmMain/kotlin/space/kscience/kmath/stat/RandomSourceGenerator.kt
+++ b/kmath-stat/src/jvmMain/kotlin/space/kscience/kmath/stat/RandomSourceGenerator.kt
@@ -32,7 +32,7 @@ public class RandomSourceGenerator internal constructor(public val source: Rando
  *
  * @property generator the underlying [RandomGenerator] object.
  */
-public inline class RandomGeneratorProvider(public val generator: RandomGenerator) : UniformRandomProvider {
+public class RandomGeneratorProvider(public val generator: RandomGenerator) : UniformRandomProvider {
     /**
      * Generates a [Boolean] value.
      *
diff --git a/kmath-viktor/src/main/kotlin/space/kscience/kmath/viktor/ViktorBuffer.kt b/kmath-viktor/src/main/kotlin/space/kscience/kmath/viktor/ViktorBuffer.kt
index 1592763db..9d817112d 100644
--- a/kmath-viktor/src/main/kotlin/space/kscience/kmath/viktor/ViktorBuffer.kt
+++ b/kmath-viktor/src/main/kotlin/space/kscience/kmath/viktor/ViktorBuffer.kt
@@ -4,7 +4,7 @@ import org.jetbrains.bio.viktor.F64FlatArray
 import space.kscience.kmath.structures.MutableBuffer
 
 @Suppress("NOTHING_TO_INLINE", "OVERRIDE_BY_INLINE")
-public inline class ViktorBuffer(public val flatArray: F64FlatArray) : MutableBuffer<Double> {
+public class ViktorBuffer(public val flatArray: F64FlatArray) : MutableBuffer<Double> {
     public override val size: Int
         get() = flatArray.size