threatcode · pull · Jun 21, 2026 · Jun 20, 2026 · Jun 21, 2026
diff --git a/test/core/ast/from_js.test.mjs b/test/core/ast/from_js.test.mjs
@@ -17,6 +17,10 @@ describe('ast from_js', () => {
     assert.deepEqual(jsToAst(undefined, CORE_SCHEMA), [{ contents: null, directives: [] }])
   })
 
+  it('replaces undefined sequence items with null', () => {
+    assert.equal(dump([undefined]), '- null\n')
+  })
+
   it('dedups a cycle through a Map', () => {
     const source = new Map()
     source.set('self', source)

diff --git a/test/core/issues.test.mjs b/test/core/issues.test.mjs
diff --git a/test/core/issues/0027.mjs b/test/core/issues/0027.mjs
diff --git a/test/core/issues/0054.mjs b/test/core/issues/0054.mjs
diff --git a/test/core/issues/0063.mjs b/test/core/issues/0063.mjs
diff --git a/test/core/issues/0080.mjs b/test/core/issues/0080.mjs
diff --git a/test/core/issues/0112.mjs b/test/core/issues/0112.mjs
diff --git a/test/core/issues/0117.mjs b/test/core/issues/0117.mjs
diff --git a/test/core/issues/0164.mjs b/test/core/issues/0164.mjs
diff --git a/test/core/issues/0243-basic.yml b/test/core/issues/0243-basic.yml
diff --git a/test/core/issues/0243-nested.yml b/test/core/issues/0243-nested.yml
diff --git a/test/core/issues/0243.mjs b/test/core/issues/0243.mjs