fix(RevenueCatUI): accept integral double writes to integer state keys (iOS parity)

Author: AlvaroBrey

ui/revenuecatui/src/main/kotlin/com/revenuecat/purchases/ui/revenuecatui/data/PaywallStateStore.kt

@@ -67,7 +67,8 @@ private fun JsonPrimitive.matchesDeclaredType(declaredType: StateDeclaration.Val
     when (declaredType) {
         StateDeclaration.ValueType.BOOLEAN -> !isString && booleanOrNull != null
         StateDeclaration.ValueType.STRING -> isString
-        StateDeclaration.ValueType.INTEGER -> !isString && longOrNull != null
+        // Integral doubles are accepted for parity with iOS, which coerces them via Int(exactly:).
+        StateDeclaration.ValueType.INTEGER -> !isString && (longOrNull != null || doubleOrNull?.rem(1.0) == 0.0)
         StateDeclaration.ValueType.DOUBLE -> !isString && doubleOrNull != null
         StateDeclaration.ValueType.UNKNOWN -> false
     }

ui/revenuecatui/src/test/kotlin/com/revenuecat/purchases/ui/revenuecatui/data/PaywallStateStoreTests.kt

@@ -74,6 +74,24 @@ internal class PaywallStateStoreTests {
         assertThat(store.currentValueOrDefault("open")).isEqualTo(JsonPrimitive(false))
     }
 
+    @Test
+    fun `accepts an integral double write to an integer-typed key`() {
+        val store = PaywallStateStore(mapOf("slide" to declaration(StateDeclaration.ValueType.INTEGER, JsonPrimitive(0))))
+
+        store.applyUpdates(listOf(setUpdate("slide", StateUpdateValue.Literal(JsonPrimitive(2.0)))))
+
+        assertThat(store.currentValueOrDefault("slide")).isEqualTo(JsonPrimitive(2.0))
+    }
+
+    @Test
+    fun `ignores a fractional double write to an integer-typed key`() {
+        val store = PaywallStateStore(mapOf("slide" to declaration(StateDeclaration.ValueType.INTEGER, JsonPrimitive(0))))
+
+        store.applyUpdates(listOf(setUpdate("slide", StateUpdateValue.Literal(JsonPrimitive(2.5)))))
+
+        assertThat(store.currentValueOrDefault("slide")).isEqualTo(JsonPrimitive(0))
+    }
+
     @Test
     fun `accepts an integer write to a double-typed key`() {
         val store = PaywallStateStore(mapOf("ratio" to declaration(StateDeclaration.ValueType.DOUBLE, JsonPrimitive(0.0))))