fix: stabilize runtime follow-up regressions

site/doc/pages/is_array.txt

@@ -0,0 +1,34 @@
+:sig
+bool DTree::is_array() const
+
+:params
+return value : true when the node is map-shaped
+
+:see
+>types
+0_DTree
+is_list
+has
+each
+
+:content
+Tests whether a `DTree` node is map-shaped, i.e. holds nested child values rather than a scalar. This is a read accessor: it is `const`, never creates or modifies nodes, and dereferences internal references automatically.
+
+`is_array()` is true for both list-like and keyed containers; use `is_list()` to distinguish the two:
+
+```cpp
+DTree rows = sqlite_query(db, "select * from notes");
+if(rows.is_array())
+{
+	rows.each([&](const DTree& row, String key) {
+		// ...
+	});
+}
+```
+
+Scalar values (strings, numbers, booleans, pointers) return `false`, as do unresolvable references.
+
+## Related Concepts
+
+- PHP: `is_array()`
+- JavaScript: `typeof value === "object"`