diff --git a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/AutoboxingTransformer.kt b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/AutoboxingTransformer.kt
index a027abe4f2d..97dd540c35f 100644
--- a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/AutoboxingTransformer.kt
+++ b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/AutoboxingTransformer.kt
@@ -13,9 +13,7 @@ import org.jetbrains.kotlin.ir.backend.js.ir.JsIrBuilder
 import org.jetbrains.kotlin.ir.backend.js.utils.realOverrideTarget
 import org.jetbrains.kotlin.ir.declarations.*
 import org.jetbrains.kotlin.ir.expressions.*
-import org.jetbrains.kotlin.ir.types.IrType
-import org.jetbrains.kotlin.ir.types.isNothing
-import org.jetbrains.kotlin.ir.types.makeNotNull
+import org.jetbrains.kotlin.ir.types.*
 import org.jetbrains.kotlin.ir.util.*
 
 
@@ -73,6 +71,13 @@ class AutoboxingTransformer(val context: JsIrBackendContext) : AbstractValueUsag
         val actualInlinedClass = actualType.getInlinedClass()
         val expectedInlinedClass = expectedType.getInlinedClass()
 
+        // Mimicking behaviour of current JS backend
+        // TODO: Revisit
+        if (
+            (actualType is IrDynamicType && expectedType.makeNotNull().isChar()) ||
+            (actualType.makeNotNull().isChar() && expectedType is IrDynamicType)
+        ) return this
+
         val function = when {
             actualInlinedClass == null && expectedInlinedClass == null -> return this
             actualInlinedClass != null && expectedInlinedClass == null -> context.intrinsics.jsBoxIntrinsic
diff --git a/js/js.translator/testData/_commonFiles/testUtils.kt b/js/js.translator/testData/_commonFiles/testUtils.kt
new file mode 100644
index 00000000000..683ec90241c
--- /dev/null
+++ b/js/js.translator/testData/_commonFiles/testUtils.kt
@@ -0,0 +1,6 @@
+package testUtils
+
+fun isLegacyBackend(): Boolean =
+    // Using eval to prevent DCE from thinking that following code depends on Kotlin module.
+    eval("(typeof Kotlin != \"undefined\" && typeof Kotlin.kotlin != \"undefined\")").unsafeCast<Boolean>()
+
diff --git a/js/js.translator/testData/box/char/topLevelCallables.kt b/js/js.translator/testData/box/char/topLevelCallables.kt
index bd64c001bd1..28b232cbc42 100644
--- a/js/js.translator/testData/box/char/topLevelCallables.kt
+++ b/js/js.translator/testData/box/char/topLevelCallables.kt
@@ -1,5 +1,5 @@
-// IGNORE_BACKEND: JS_IR
 // SKIP_MINIFICATION
+@JsName("foo")
 fun foo(): Char = '1'
 
 val p1: Char = '2'
diff --git a/js/js.translator/testData/box/coercion/bridgeChar.kt b/js/js.translator/testData/box/coercion/bridgeChar.kt
index 147e100a716..53d90c68252 100644
--- a/js/js.translator/testData/box/coercion/bridgeChar.kt
+++ b/js/js.translator/testData/box/coercion/bridgeChar.kt
@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 // EXPECTED_REACHABLE_NODES: 1293
 open class A {
     fun foo(): Char = 'X'
diff --git a/js/js.translator/testData/box/coercion/charValParameter.kt b/js/js.translator/testData/box/coercion/charValParameter.kt
index 68ade2ff60c..050ad57c5e4 100644
--- a/js/js.translator/testData/box/coercion/charValParameter.kt
+++ b/js/js.translator/testData/box/coercion/charValParameter.kt
@@ -1,14 +1,15 @@
-// IGNORE_BACKEND: JS_IR
-// EXPECTED_REACHABLE_NODES: 1283
+// EXPECTED_REACHABLE_NODES: 1276
 class A(val x: Char)
 
 fun typeOf(x: dynamic): String = js("typeof x")
 
+val expectedCharRepresentationInProperty = if (testUtils.isLegacyBackend()) "object" else "number"
+
 fun box(): String {
     val a = A('0')
 
     var r = typeOf(a.asDynamic().x)
-    if (r != "object") return "fail1: $r"
+    if (r != expectedCharRepresentationInProperty) return "fail1: $r"
 
     r = typeOf(a.x)
     if (r != "number") return "fail2: $r"
diff --git a/js/js.translator/testData/box/coercion/defaultAccessors.kt b/js/js.translator/testData/box/coercion/defaultAccessors.kt
index 02bb6adca40..4768c3549c6 100644
--- a/js/js.translator/testData/box/coercion/defaultAccessors.kt
+++ b/js/js.translator/testData/box/coercion/defaultAccessors.kt
@@ -1,5 +1,4 @@
-// IGNORE_BACKEND: JS_IR
-// EXPECTED_REACHABLE_NODES: 1295
+// EXPECTED_REACHABLE_NODES: 1288
 interface I {
     val a: Char
 }
@@ -18,9 +17,11 @@ object Y : I {
         }
 }
 
+val expectedCharRepresentationInProperty = if (testUtils.isLegacyBackend()) "object" else "number"
+
 fun box(): String {
     val t = jsTypeOf(X.asDynamic().a)
-    if (t != "object") return "fail1: $t"
+    if (t != expectedCharRepresentationInProperty) return "fail1: $t"
 
     Y.a = '@'
     Y.a
diff --git a/js/js.translator/testData/box/coercion/derivedFunctionReturningChar.kt b/js/js.translator/testData/box/coercion/derivedFunctionReturningChar.kt
index 28b1bf6d726..87f84604411 100644
--- a/js/js.translator/testData/box/coercion/derivedFunctionReturningChar.kt
+++ b/js/js.translator/testData/box/coercion/derivedFunctionReturningChar.kt
@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 // EXPECTED_REACHABLE_NODES: 1292
 abstract class A<out T> {
     abstract fun foo(): T
diff --git a/js/js.translator/testData/box/coercion/extensionReceiver.kt b/js/js.translator/testData/box/coercion/extensionReceiver.kt
index 1b1177086d8..1b247053d73 100644
--- a/js/js.translator/testData/box/coercion/extensionReceiver.kt
+++ b/js/js.translator/testData/box/coercion/extensionReceiver.kt
@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 // EXPECTED_REACHABLE_NODES: 1282
 fun box(): String {
     val a = 'Q'.foo()
diff --git a/js/js.translator/testData/box/coercion/lambdaParameters.kt b/js/js.translator/testData/box/coercion/lambdaParameters.kt
index 637e9ba225c..8b54c9d9ed4 100644
--- a/js/js.translator/testData/box/coercion/lambdaParameters.kt
+++ b/js/js.translator/testData/box/coercion/lambdaParameters.kt
@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 // EXPECTED_REACHABLE_NODES: 1283
 // CHECK_NOT_CALLED_IN_SCOPE: function=toBoxedChar scope=box$lambda
 // CHECK_CALLED_IN_SCOPE: function=unboxChar scope=box$lambda
diff --git a/js/js.translator/testData/box/coercion/propertyBridgeChar.kt b/js/js.translator/testData/box/coercion/propertyBridgeChar.kt
index 4ca390d67c8..87e1924428e 100644
--- a/js/js.translator/testData/box/coercion/propertyBridgeChar.kt
+++ b/js/js.translator/testData/box/coercion/propertyBridgeChar.kt
@@ -1,5 +1,4 @@
-// IGNORE_BACKEND: JS_IR
-// EXPECTED_REACHABLE_NODES: 1296
+// EXPECTED_REACHABLE_NODES: 1289
 open class A {
     val foo: Char
         get() = 'X'
@@ -35,6 +34,8 @@ fun typeOf(x: dynamic): String = js("typeof x")
 
 var typeOfMutable = ""
 
+val expectedCharRepresentationInProperty = if (testUtils.isLegacyBackend()) "object" else "number"
+
 fun box(): String {
     val a = B()
     val b: I = B()
@@ -46,23 +47,23 @@ fun box(): String {
     if (r2 != "object") return "fail2: $r2"
 
     val r3 = typeOf(a.asDynamic().foo)
-    if (r3 != "object") return "fail3: $r3"
+    if (r3 != expectedCharRepresentationInProperty) return "fail3: $r3"
 
     val r4 = typeOf(a.asDynamic().bar)
-    if (r4 != "object") return "fail4: $r4"
+    if (r4 != expectedCharRepresentationInProperty) return "fail4: $r4"
 
     val r5 = typeOf(a.asDynamic().baz)
-    if (r5 != "object") return "fail5: $r5"
+    if (r5 != expectedCharRepresentationInProperty) return "fail5: $r5"
 
     a.bar++
     val r6 = typeOf(a.asDynamic().bar)
-    if (r6 != "object") return "fail6: $r6"
+    if (r6 != expectedCharRepresentationInProperty) return "fail6: $r6"
 
     val r7 = typeOf(a.asDynamic().mutable)
-    if (r7 != "object") return "fail7: $r7"
+    if (r7 != expectedCharRepresentationInProperty) return "fail7: $r7"
 
     a.mutable = 'E'
-    if (typeOfMutable != "number;object;number") return "fail8: $typeOfMutable"
+    if (typeOfMutable != "number;$expectedCharRepresentationInProperty;number") return "fail8: $typeOfMutable"
 
     val r9 = typeOf(a.mutable)
     if (r9 != "number") return "fail9: $r9"
diff --git a/js/js.translator/testData/box/coercion/receiverSmartCast.kt b/js/js.translator/testData/box/coercion/receiverSmartCast.kt
index ff5651a81d9..0ba720655bc 100644
--- a/js/js.translator/testData/box/coercion/receiverSmartCast.kt
+++ b/js/js.translator/testData/box/coercion/receiverSmartCast.kt
@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 // EXPECTED_REACHABLE_NODES: 1283
 fun foo(x: Any): String {
     return when (x) {
diff --git a/js/js.translator/testData/box/standardClasses/charArrayGetSet.kt b/js/js.translator/testData/box/standardClasses/charArrayGetSet.kt
index f3b51448b4a..3275dd5d08d 100644
--- a/js/js.translator/testData/box/standardClasses/charArrayGetSet.kt
+++ b/js/js.translator/testData/box/standardClasses/charArrayGetSet.kt
@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 // EXPECTED_REACHABLE_NODES: 1281
 fun box(): String {
     val a = CharArray(1)