diff --git a/attributes-kt/src/commonMain/kotlin/space/kscience/attributes/Attributes.kt b/attributes-kt/src/commonMain/kotlin/space/kscience/attributes/Attributes.kt
index 5eb93bfc0..936cf2ee2 100644
--- a/attributes-kt/src/commonMain/kotlin/space/kscience/attributes/Attributes.kt
+++ b/attributes-kt/src/commonMain/kotlin/space/kscience/attributes/Attributes.kt
@@ -140,8 +140,18 @@ public fun <A : Attribute<Unit>> Attributes(
     attribute: A,
 ): Attributes = MapAttributes(mapOf(attribute to Unit))
 
-public operator fun Attributes.plus(other: Attributes): Attributes = when{
+/**
+ * Create a new [Attributes] that overlays [other] on top of this set of attributes. New attributes are added.
+ * Existing attribute keys are replaced.
+ */
+public operator fun Attributes.plus(other: Attributes): Attributes = when {
     isEmpty() -> other
     other.isEmpty() -> this
     else -> MapAttributes(content + other.content)
-}
\ No newline at end of file
+}
+
+/**
+ * Create a new [Attributes] with removed [key] (if it is present).
+ */
+public operator fun Attributes.minus(key: Attribute<*>): Attributes =
+    if (content.contains(key)) MapAttributes(content.minus(key)) else this
\ No newline at end of file
diff --git a/benchmarks/build.gradle.kts b/benchmarks/build.gradle.kts
index 020ef745f..9e0d095d6 100644
--- a/benchmarks/build.gradle.kts
+++ b/benchmarks/build.gradle.kts
@@ -80,7 +80,7 @@ benchmark {
     // Setup configurations
     targets {
         register("jvm")
-//        register("js")
+        register("js")
     }
 
     fun kotlinx.benchmark.gradle.BenchmarkConfiguration.commonConfiguration() {
diff --git a/kmath-ast/build.gradle.kts b/kmath-ast/build.gradle.kts
index a770912f3..2cd0979ae 100644
--- a/kmath-ast/build.gradle.kts
+++ b/kmath-ast/build.gradle.kts
@@ -4,7 +4,20 @@ plugins {
 
 kscience {
     jvm()
-    js()
+    js{
+        nodejs {
+            testTask {
+                useMocha().timeout = "0"
+            }
+        }
+
+        browser {
+            useCommonJs()
+            testTask {
+                useMocha().timeout = "0"
+            }
+        }
+    }
     native()
 
     dependencies {
@@ -18,7 +31,7 @@ kscience {
 
     dependencies(jsMain) {
         implementation(npm("astring", "1.7.5"))
-        implementation(npm("binaryen", "101.0.0"))
+        implementation(npm("binaryen", "117.0.0"))
         implementation(npm("js-base64", "3.6.1"))
     }
 
@@ -29,19 +42,6 @@ kscience {
 }
 
 kotlin {
-    js {
-        nodejs {
-            testTask {
-                useMocha().timeout = "0"
-            }
-        }
-
-        browser {
-            testTask {
-                useMocha().timeout = "0"
-            }
-        }
-    }
 
     sourceSets {
         filter { it.name.contains("test", true) }