From 678cfbf45eea56f43c590559e011576ef1f5081f Mon Sep 17 00:00:00 2001
From: sergeych <real.sergeych@gmail.com>
Date: Sun, 7 Dec 2025 21:50:29 +0100
Subject: [PATCH] fix #85 lynon empty list encoding

---
 .../kotlin/net/sergeych/lynon/LynonEncoder.kt       |  8 +++++---
 lynglib/src/commonTest/kotlin/ScriptTest.kt         |  7 +++++++
 lynglib/src/jvmTest/kotlin/LynonTests.kt            | 13 +++++++++++++
 3 files changed, 25 insertions(+), 3 deletions(-)

diff --git a/lynglib/src/commonMain/kotlin/net/sergeych/lynon/LynonEncoder.kt b/lynglib/src/commonMain/kotlin/net/sergeych/lynon/LynonEncoder.kt
index 737e78e..225add5 100644
--- a/lynglib/src/commonMain/kotlin/net/sergeych/lynon/LynonEncoder.kt
+++ b/lynglib/src/commonMain/kotlin/net/sergeych/lynon/LynonEncoder.kt
@@ -127,9 +127,11 @@ open class LynonEncoder(val bout: BitOutput, val settings: LynonSettings = Lynon
      */
     suspend fun encodeAnyList(scope: Scope, list: List<Obj>,fixedSize: Boolean = false) {
         if( list.isEmpty()) {
-            // any-typed, empty, save space
-            putBit(0)
-            encodeUnsigned(0u)
+            // Empty list: we still need to write the heterogenous/homogenous flag bit
+            // but must NOT write the size when fixedSize is provided, as decoder will
+            // use the provided size and won't read it from the stream.
+            putBit(0) // treat empty lists as heterogeneous
+            if (!fixedSize) encodeUnsigned(0u)
         }
         else {
             val objClass = list[0].objClass
diff --git a/lynglib/src/commonTest/kotlin/ScriptTest.kt b/lynglib/src/commonTest/kotlin/ScriptTest.kt
index 8bc04c2..c761d6f 100644
--- a/lynglib/src/commonTest/kotlin/ScriptTest.kt
+++ b/lynglib/src/commonTest/kotlin/ScriptTest.kt
@@ -4013,6 +4013,13 @@ class ScriptTest {
         assertEquals( TestJson4(TestEnum.One), x)
     }
 
+    @Test
+    fun testStringLast() = runTest {
+        eval("""
+            assertEquals('t', "assert".last())  
+        """.trimIndent())
+    }
+
     @Test
     fun testLogicalNot() = runTest {
         eval("""
diff --git a/lynglib/src/jvmTest/kotlin/LynonTests.kt b/lynglib/src/jvmTest/kotlin/LynonTests.kt
index 89634cb..f597c5d 100644
--- a/lynglib/src/jvmTest/kotlin/LynonTests.kt
+++ b/lynglib/src/jvmTest/kotlin/LynonTests.kt
@@ -778,6 +778,19 @@ class Wallet( id, ownerKey, balance=0, createdAt=Instant.now().truncateToSecond(
             assert( Lynon.encode(Poin3(1,2)).size <= 110)
         """.trimIndent())
     }
+
+    @Test
+    fun testLyngDecodeResult() = runTest {
+        val  a = eval("""
+            [Map(),Map(),Map()]
+        """.trimIndent())
+        val b = lynonDecodeAny(Scope(), lynonEncodeAny(Scope(), a))
+        assertEquals(a, b )
+    //        val c = b.decodeSerializable<JsonElement>()
+//        println(c)
+    }
+
+
 }