From c0bfeb9961c6c54cf128539256537549c1d8d6ea Mon Sep 17 00:00:00 2001
From: Micrograx <valentinocerutti@gmail.com>
Date: Wed, 29 Apr 2026 15:52:01 -0300
Subject: [PATCH 1/2] Use builtin.null_list in both list and dict is_empty

---
 lib/aiken/collection/dict.ak | 5 +----
 lib/aiken/collection/list.ak | 5 +----
 2 files changed, 2 insertions(+), 8 deletions(-)

diff --git a/lib/aiken/collection/dict.ak b/lib/aiken/collection/dict.ak
index a984e0b..835ce30 100644
--- a/lib/aiken/collection/dict.ak
+++ b/lib/aiken/collection/dict.ak
@@ -379,10 +379,7 @@ fn do_has_key(self: Pairs<ByteArray, value>, key k: ByteArray) -> Bool {
 /// dict.is_empty(dict.empty) == True
 /// ```
 pub fn is_empty(self: Dict<key, value>) -> Bool {
-  when self.inner is {
-    [] -> True
-    _ -> False
-  }
+  builtin.null_list(self.inner)
 }
 
 /// Extract all the keys present in a given `Dict`.
diff --git a/lib/aiken/collection/list.ak b/lib/aiken/collection/list.ak
index ef6a93d..ab0f461 100644
--- a/lib/aiken/collection/list.ak
+++ b/lib/aiken/collection/list.ak
@@ -205,10 +205,7 @@ pub fn head(self: List<a>) -> Option<a> {
 /// list.is_empty([1, 2, 3]) == False
 /// ```
 pub fn is_empty(self: List<a>) -> Bool {
-  when self is {
-    [] -> True
-    _ -> False
-  }
+  builtin.null_list(self)
 }
 
 /// Gets the index of an element of a list, if any. Otherwise, returns None.

From e2f4743fd7b05507d49be163ada911fc4c1853c8 Mon Sep 17 00:00:00 2001
From: Valentino Cerutti <valentinocerutti@gmail.com>
Date: Fri, 8 May 2026 13:30:51 -0300
Subject: [PATCH 2/2] Use == [] in both list and dict is_empty

---
 lib/aiken/collection/dict.ak | 2 +-
 lib/aiken/collection/list.ak | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/aiken/collection/dict.ak b/lib/aiken/collection/dict.ak
index 835ce30..32cf8af 100644
--- a/lib/aiken/collection/dict.ak
+++ b/lib/aiken/collection/dict.ak
@@ -379,7 +379,7 @@ fn do_has_key(self: Pairs<ByteArray, value>, key k: ByteArray) -> Bool {
 /// dict.is_empty(dict.empty) == True
 /// ```
 pub fn is_empty(self: Dict<key, value>) -> Bool {
-  builtin.null_list(self.inner)
+  self.inner == []
 }
 
 /// Extract all the keys present in a given `Dict`.
diff --git a/lib/aiken/collection/list.ak b/lib/aiken/collection/list.ak
index ab0f461..cda4059 100644
--- a/lib/aiken/collection/list.ak
+++ b/lib/aiken/collection/list.ak
@@ -205,7 +205,7 @@ pub fn head(self: List<a>) -> Option<a> {
 /// list.is_empty([1, 2, 3]) == False
 /// ```
 pub fn is_empty(self: List<a>) -> Bool {
-  builtin.null_list(self)
+  self == []
 }
 
 /// Gets the index of an element of a list, if any. Otherwise, returns None.