diff --git a/src/schema/TODO.md b/src/schema/TODO.md
index 580545a..bbd1432 100644
--- a/src/schema/TODO.md
+++ b/src/schema/TODO.md
@@ -1,5 +1,8 @@
 # nulib\schema
 
+* ScalarSchema::from_property()
+* AssocSchema === ScalarSchema(["array", "" => ["scalar", "subtype" => "assoc"]])
+* ListSchema === ScalarSchema(["array", "" => ["scalar", "subtype" => "list"]])
 * possibilité de spécifier un type via sa classe, e.g
   ~~~php
   Schema::ns($schema, [
@@ -15,7 +18,6 @@
   ~~~
   MyClass ne doit pas implémenter IType, et le type correspondant est créé avec
   `new tgeneric(MyClass::class)`
-* ScalarSchema::from_property()
 
 * dans AssocSchema, support `[key_prefix]` qui permet de spécifier un préfixe
   commun aux champs dans le tableau destination, e.g
diff --git a/src/schema/_scalar/ScalarSchema.php b/src/schema/_scalar/ScalarSchema.php
index 3d6594d..507d73c 100644
--- a/src/schema/_scalar/ScalarSchema.php
+++ b/src/schema/_scalar/ScalarSchema.php
@@ -172,12 +172,12 @@ class ScalarSchema extends Schema {
     if (count($types) == 1 && $types[0] !== null) {
       foreach ($types as $key => $name) {
         if ($key === 0) {
-          $params = null;
+          $args = null;
         } else {
-          $params = $name;
+          $args = $name;
           $name = $key;
         }
-        $definition["type"] = types::get($nullable, $name, $params, $definition);
+        $definition["type"] = types::get($nullable, $name, $args, $definition);
       }
     }
 
diff --git a/src/schema/_scalar/ScalarWrapper.php b/src/schema/_scalar/ScalarWrapper.php
index da320da..110c6f8 100644
--- a/src/schema/_scalar/ScalarWrapper.php
+++ b/src/schema/_scalar/ScalarWrapper.php
@@ -106,12 +106,12 @@ class ScalarWrapper extends Wrapper {
       foreach ($schemaTypes as $key => $name) {
         if ($key === $index) {
           $index++;
-          $params = null;
+          $args = null;
         } else {
-          $params = $name;
+          $args = $name;
           $name = $key;
         }
-        $type = types::get($schema->nullable, $name, $params, $this->schema->getDefinition());
+        $type = types::get($schema->nullable, $name, $args, $this->schema->getDefinition());
         if ($firstType === null) $firstType = $type;
         $types[] = $type;
         if ($type->isAvailable($input, $valueKey)) {
diff --git a/src/schema/types.php b/src/schema/types.php
index e3489c5..7e3442a 100644
--- a/src/schema/types.php
+++ b/src/schema/types.php
@@ -31,8 +31,8 @@ class types {
     return self::$registry;
   }
 
-  static function get(bool $nullable, ?string $name, ?array $params=null, ?array $definition=null): IType {
-    return self::registry()->get($nullable, $name, $params, $definition);
+  static function get(bool $nullable, ?string $name, ?array $args=null, ?array $definition=null): IType {
+    return self::registry()->get($nullable, $name, $args, $definition);
   }
 
   static function rawstring(bool $nullable=true): trawstring { return self::get($nullable, "rawstring"); }
diff --git a/src/schema/types/Registry.php b/src/schema/types/Registry.php
index 5c08c92..eb16596 100644
--- a/src/schema/types/Registry.php
+++ b/src/schema/types/Registry.php
@@ -30,12 +30,21 @@ class Registry {
   /** @var IType[] */
   protected $types;
 
-  function get(bool $nullable, ?string $name, ?array $params=null, ?array $definition=null): IType {
+  function get(bool $nullable, ?string $name, ?array $args=null, ?array $definition=null): IType {
     $name ??= "raw";
     $class = self::TYPES[$name];
+    if (cl::is_list($args)) {
+      $key = array_key_last($args);
+      $params = $args[$key];
+      unset($args[$key]);
+    } else {
+      $params = $args;
+      $args = null;
+    }
     $params = cl::merge($class::get_params_from_definition($definition), $params);
-    if ($params !== null) {
-      return func::with([$class, false, $nullable, $params])->invoke();
+    if ($args || $params !== null) {
+      $args ??= [];
+      return func::with([$class, false, ...$args, $nullable, $params])->invoke();
     }
     if ($nullable) $name = "?$name";
     $type = cl::get($this->types, $name);
diff --git a/src/schema/types/_tsimple.php b/src/schema/types/_tsimple.php
index ac0aa36..072806e 100644
--- a/src/schema/types/_tsimple.php
+++ b/src/schema/types/_tsimple.php
@@ -15,6 +15,10 @@ abstract class _tsimple implements IType {
     return null;
   }
 
+  /**
+   * $nullable et $params doivent toujours être les derniers arguments du
+   * constructeur
+   */
   function __construct(bool $nullable, ?array $params=null) {
     $this->nullable = $nullable;
     $this->params = $params;