diff --git a/nur_src/b/io/SharedFile.php b/nur_src/b/io/SharedFile.php
index 14fcbbc..3a22468 100644
--- a/nur_src/b/io/SharedFile.php
+++ b/nur_src/b/io/SharedFile.php
@@ -3,7 +3,6 @@ namespace nur\b\io;
 
 use nur\b\ICloseable;
 use nur\os;
-use nur\path;
 
 /**
  * Class SharedFile: un fichier accédé par plusieurs processus en même temps.
diff --git a/nur_src/b/params/Tparametrable1.php b/nur_src/b/params/Tparametrable1.php
index d3b0bed..e51b4b5 100644
--- a/nur_src/b/params/Tparametrable1.php
+++ b/nur_src/b/params/Tparametrable1.php
@@ -1,8 +1,6 @@
 <?php
 namespace nur\b\params;
 
-use nur\A;
-use nur\data\types\md_utils;
 use nur\data\types\Metadata;
 
 /**
diff --git a/nur_src/cli/Application.php b/nur_src/cli/Application.php
index f9c99fb..91962f4 100644
--- a/nur_src/cli/Application.php
+++ b/nur_src/cli/Application.php
@@ -9,9 +9,9 @@ use nur\config\ArrayConfig;
 use nur\msg;
 use nur\os;
 use nur\path;
-use nur\sery\output\say as nsay;
 use nur\sery\output\log as nlog;
 use nur\sery\output\msg as nmsg;
+use nur\sery\output\say as nsay;
 use nur\sery\output\std\StdMessenger as nStdMessenger;
 
 /**
diff --git a/nur_src/data/types/_Tparametrable1.php b/nur_src/data/types/_Tparametrable1.php
index 4389553..82cf8d6 100644
--- a/nur_src/data/types/_Tparametrable1.php
+++ b/nur_src/data/types/_Tparametrable1.php
@@ -1,8 +1,6 @@
 <?php
 namespace nur\data\types;
 
-use nur\b\params\parametrable_utils;
-
 /**
  * variante de {@link Tparametrable1} qui n'utilise pas {@link Metadata} pour
  * éviter une boucle infinie.
diff --git a/nur_src/io/csv/Csv2AssocHelper.php b/nur_src/io/csv/Csv2AssocHelper.php
index 9471150..26f3c2a 100644
--- a/nur_src/io/csv/Csv2AssocHelper.php
+++ b/nur_src/io/csv/Csv2AssocHelper.php
@@ -2,7 +2,6 @@
 namespace nur\io\csv;
 
 use nur\A;
-use nur\SL;
 
 /**
  * Class Csv2AssocHelper: outils pour lire un flux au format CSV
diff --git a/nur_src/io/fsv/FsvReader.php b/nur_src/io/fsv/FsvReader.php
index 9301513..d0a0c57 100644
--- a/nur_src/io/fsv/FsvReader.php
+++ b/nur_src/io/fsv/FsvReader.php
@@ -10,7 +10,6 @@ use nur\b\io\Tfilter;
 use nur\b\params\Parametrable;
 use nur\b\params\Tparametrable;
 use nur\b\ValueException;
-use nur\io\Tencoding;
 use nur\reader;
 use nur\str;
 
diff --git a/nur_src/ldap/LdapObject.php b/nur_src/ldap/LdapObject.php
index 76aceb5..43f511c 100644
--- a/nur_src/ldap/LdapObject.php
+++ b/nur_src/ldap/LdapObject.php
@@ -5,7 +5,6 @@ use ArrayAccess;
 use Countable;
 use nur\A;
 use nur\b\IllegalAccessException;
-use nur\ldap\syntaxes\CompositeSyntax;
 use nur\ldap\syntaxes\StringSyntax;
 
 /**
diff --git a/nur_src/ldap/schemas/SchemaManager.php b/nur_src/ldap/schemas/SchemaManager.php
index 3c3f386..a9b8757 100644
--- a/nur_src/ldap/schemas/SchemaManager.php
+++ b/nur_src/ldap/schemas/SchemaManager.php
@@ -3,7 +3,6 @@ namespace nur\ldap\schemas;
 
 use nur\A;
 use nur\func;
-use nur\ldap\CompositeAttr;
 use nur\ldap\LdapAttr;
 use nur\ldap\LdapConn;
 use nur\ldap\syntaxes\AbstractSyntax;
diff --git a/nur_src/mapper/base/FuncMapper.php b/nur_src/mapper/base/FuncMapper.php
index 7fb0bf1..eb04bd6 100644
--- a/nur_src/mapper/base/FuncMapper.php
+++ b/nur_src/mapper/base/FuncMapper.php
@@ -1,7 +1,6 @@
 <?php
 namespace nur\mapper\base;
 
-use nur\b\params\parametrable_utils;
 use nur\b\params\Tparametrable;
 use nur\func;
 
diff --git a/nur_src/mapper/csv/AbstractCsvMapper.php b/nur_src/mapper/csv/AbstractCsvMapper.php
index 951e2fd..80d57b5 100644
--- a/nur_src/mapper/csv/AbstractCsvMapper.php
+++ b/nur_src/mapper/csv/AbstractCsvMapper.php
@@ -1,8 +1,6 @@
 <?php
 namespace nur\mapper\csv;
 
-use nur\A;
-use nur\b\params\parametrable_utils;
 use nur\b\params\Tparametrable;
 use nur\b\ValueException;
 use nur\mapper\base\Mapper;
diff --git a/nur_src/mapper/csv/Csv2AssocMapper.php b/nur_src/mapper/csv/Csv2AssocMapper.php
index 5ea50fe..b0937b6 100644
--- a/nur_src/mapper/csv/Csv2AssocMapper.php
+++ b/nur_src/mapper/csv/Csv2AssocMapper.php
@@ -1,7 +1,6 @@
 <?php
 namespace nur\mapper\csv;
 
-use nur\b\params\parametrable_utils;
 use nur\b\params\Tparametrable;
 use nur\mapper\item\Seq2AssocMapper;
 
diff --git a/nur_src/mapper/csv/CsvReader.php b/nur_src/mapper/csv/CsvReader.php
index af55c4b..c2c3a7d 100644
--- a/nur_src/mapper/csv/CsvReader.php
+++ b/nur_src/mapper/csv/CsvReader.php
@@ -1,17 +1,14 @@
 <?php
 namespace nur\mapper\csv;
 
-use nur\A;
 use nur\b\io\EOFException;
 use nur\b\io\IReader;
 use nur\b\io\Tfilter;
-use nur\b\params\parametrable_utils;
 use nur\b\params\Tparametrable;
 use nur\data\types\Metadata;
 use nur\mapper\base\encoding_utils;
 use nur\mapper\base\Producer;
 use nur\mapper\base\Tencoding;
-use nur\mapper\line\IconvMapper;
 use nur\reader;
 
 /**
diff --git a/nur_src/mapper/fsv/Assoc2FsvMapper.php b/nur_src/mapper/fsv/Assoc2FsvMapper.php
index 13de785..40e0431 100644
--- a/nur_src/mapper/fsv/Assoc2FsvMapper.php
+++ b/nur_src/mapper/fsv/Assoc2FsvMapper.php
@@ -6,7 +6,6 @@ use nur\b\params\Tparametrable;
 use nur\b\ValueException;
 use nur\mapper\base\encoding_utils;
 use nur\mapper\base\Mapper;
-use nur\mapper\base\Tencoding;
 
 /**
  * Class Assoc2FsvMapper: mapper qui convertir un flux de tableaux associatifs
diff --git a/nur_src/mapper/fsv/FsvReader.php b/nur_src/mapper/fsv/FsvReader.php
index 7a57a5f..d0935a3 100644
--- a/nur_src/mapper/fsv/FsvReader.php
+++ b/nur_src/mapper/fsv/FsvReader.php
@@ -4,12 +4,9 @@ namespace nur\mapper\fsv;
 use nur\b\io\EOFException;
 use nur\b\io\IReader;
 use nur\b\io\Tfilter;
-use nur\b\params\parametrable_utils;
 use nur\b\params\Tparametrable;
 use nur\mapper\base\encoding_utils;
 use nur\mapper\base\Producer;
-use nur\mapper\csv\AbstractCsvMapper;
-use nur\mapper\csv\Csv2AssocMapper;
 use nur\reader;
 use nur\str;
 
diff --git a/nur_src/mapper/fsv/FsvWriter.php b/nur_src/mapper/fsv/FsvWriter.php
index 8994233..f6c799f 100644
--- a/nur_src/mapper/fsv/FsvWriter.php
+++ b/nur_src/mapper/fsv/FsvWriter.php
@@ -2,7 +2,6 @@
 namespace nur\mapper\fsv;
 
 use nur\b\io\Tfilter;
-use nur\b\params\parametrable_utils;
 use nur\b\params\Tparametrable;
 use nur\mapper\base\Consumer;
 use nur\mapper\base\encoding_utils;
diff --git a/nur_src/mapper/item/AbstractStringMapper.php b/nur_src/mapper/item/AbstractStringMapper.php
index ad18480..dffa8b2 100644
--- a/nur_src/mapper/item/AbstractStringMapper.php
+++ b/nur_src/mapper/item/AbstractStringMapper.php
@@ -3,7 +3,6 @@ namespace nur\mapper\item;
 
 use nur\A;
 use nur\b\IllegalAccessException;
-use nur\b\params\parametrable_utils;
 use nur\b\params\Tparametrable;
 use nur\base;
 use nur\mapper\base\Mapper;
diff --git a/nur_src/mapper/item/ItemFilterMapper.php b/nur_src/mapper/item/ItemFilterMapper.php
index 231c4f0..b2b8ae3 100644
--- a/nur_src/mapper/item/ItemFilterMapper.php
+++ b/nur_src/mapper/item/ItemFilterMapper.php
@@ -3,7 +3,6 @@ namespace nur\mapper\item;
 
 use nur\A;
 use nur\b\IllegalAccessException;
-use nur\b\params\parametrable_utils;
 use nur\b\params\Tparametrable;
 use nur\b\ValueException;
 use nur\mapper\base\Mapper;
diff --git a/nur_src/mapper/line/IconvMapper.php b/nur_src/mapper/line/IconvMapper.php
index a883859..6da332a 100644
--- a/nur_src/mapper/line/IconvMapper.php
+++ b/nur_src/mapper/line/IconvMapper.php
@@ -2,8 +2,8 @@
 namespace nur\mapper\line;
 
 use nur\b\params\Tparametrable;
-use nur\mapper\base\Mapper;
 use nur\mapper\base\encoding_utils;
+use nur\mapper\base\Mapper;
 use nur\mapper\base\Tencoding;
 
 /**
diff --git a/nur_src/mapper/line/LineReader.php b/nur_src/mapper/line/LineReader.php
index 1ff2367..699f2cc 100644
--- a/nur_src/mapper/line/LineReader.php
+++ b/nur_src/mapper/line/LineReader.php
@@ -1,19 +1,14 @@
 <?php
 namespace nur\mapper\line;
 
-use nur\A;
 use nur\b\io\EOFException;
 use nur\b\io\IReader;
 use nur\b\io\Tfilter;
-use nur\b\params\parametrable_utils;
 use nur\b\params\Tparametrable;
 use nur\data\types\Metadata;
 use nur\mapper\base\encoding_utils;
 use nur\mapper\base\Producer;
 use nur\mapper\base\Tencoding;
-use nur\mapper\csv\AbstractCsvMapper;
-use nur\mapper\csv\Csv2AssocMapper;
-use nur\mapper\csv\csv_defaults;
 use nur\reader;
 
 /**
diff --git a/nur_src/mapper/line/LineWriter.php b/nur_src/mapper/line/LineWriter.php
index 9a4597f..c3bbb7e 100644
--- a/nur_src/mapper/line/LineWriter.php
+++ b/nur_src/mapper/line/LineWriter.php
@@ -1,16 +1,13 @@
 <?php
 namespace nur\mapper\line;
 
-use nur\A;
 use nur\b\io\Tfilter;
-use nur\b\params\parametrable_utils;
 use nur\b\params\Tparametrable;
 use nur\data\types\Metadata;
 use nur\mapper\base\Consumer;
 use nur\mapper\base\encoding_utils;
 use nur\mapper\base\Tencoding;
 use nur\mapper\base\Ttmpwriter;
-use nur\mapper\csv\csv_defaults;
 
 /**
  * Class LineWriter
diff --git a/nur_src/msg.php b/nur_src/msg.php
index a52075c..51aae9f 100644
--- a/nur_src/msg.php
+++ b/nur_src/msg.php
@@ -1,7 +1,6 @@
 <?php
 namespace nur;
 
-use nur\b\ExitException;
 use nur\b\ui\IMessenger;
 
 /**
diff --git a/nur_src/say.php b/nur_src/say.php
index 0db68ab..7be426a 100644
--- a/nur_src/say.php
+++ b/nur_src/say.php
@@ -1,7 +1,6 @@
 <?php
 namespace nur;
 
-use nur\b\ExitException;
 use nur\b\ui\IMessenger;
 
 /**
diff --git a/nur_src/txt.php b/nur_src/txt.php
index f876851..6c10a9b 100644
--- a/nur_src/txt.php
+++ b/nur_src/txt.php
@@ -1,8 +1,6 @@
 <?php
 namespace nur;
 
-use nur\b\text\Word;
-
 /**
  * Class txt: gestion des chaines de caractères multi-octets
  */
diff --git a/nur_src/v/bs3/Bs3NavbarManager.php b/nur_src/v/bs3/Bs3NavbarManager.php
index 673ed35..93e7996 100644
--- a/nur_src/v/bs3/Bs3NavbarManager.php
+++ b/nur_src/v/bs3/Bs3NavbarManager.php
@@ -4,7 +4,6 @@ namespace nur\v\bs3;
 use nur\A;
 use nur\b\UserException;
 use nur\b\ValueException;
-use nur\c;
 use nur\md;
 use nur\str;
 use nur\v\base\TagsManager;
diff --git a/nur_src/v/bs3/vc/CListGroup.php b/nur_src/v/bs3/vc/CListGroup.php
index 32b9b98..86a9456 100644
--- a/nur_src/v/bs3/vc/CListGroup.php
+++ b/nur_src/v/bs3/vc/CListGroup.php
@@ -1,20 +1,9 @@
 <?php
 namespace nur\v\bs3\vc;
 
-use Iterator;
-use nur\A;
-use nur\b\coll\BaseArray;
-use nur\b\params\IParametrable;
 use nur\b\params\Tparametrable;
-use nur\b\params\Tparametrable1;
 use nur\b\ValueException;
-use nur\data\types\md_utils;
-use nur\data\types\Metadata;
-use nur\func;
-use nur\iter;
-use nur\v\base\ComponentPrintable;
 use nur\v\vo;
-use Traversable;
 
 /**
  * Class CListGroup: afficher une liste d'éléments
diff --git a/nur_src/v/bs3/vc/CTable.php b/nur_src/v/bs3/vc/CTable.php
index a902b10..e8236bc 100644
--- a/nur_src/v/bs3/vc/CTable.php
+++ b/nur_src/v/bs3/vc/CTable.php
@@ -12,7 +12,6 @@ use nur\data\types\md_utils;
 use nur\data\types\Metadata;
 use nur\func;
 use nur\iter;
-use nur\sery\cl;
 use nur\SL;
 use nur\v\base\ComponentPrintable;
 use nur\v\v;
diff --git a/nur_tests/b/impl/One.php b/nur_tests/b/impl/One.php
index e3eff4b..bd465f5 100644
--- a/nur_tests/b/impl/One.php
+++ b/nur_tests/b/impl/One.php
@@ -1,8 +1,6 @@
 <?php
 namespace nur\b\impl;
 
-use nur\b\impl\Two;
-
 class One {
   function __construct() {
     $this->two = new Two();
diff --git a/nur_tests/data/types/RawStringTypeTest.php b/nur_tests/data/types/RawStringTypeTest.php
index 16aa591..96354f4 100644
--- a/nur_tests/data/types/RawStringTypeTest.php
+++ b/nur_tests/data/types/RawStringTypeTest.php
@@ -2,7 +2,6 @@
 namespace nur\data\types;
 
 use nur\b\ValueException;
-use nur\md;
 use nur\t\TestCase;
 
 class RawStringTypeTest extends TestCase {
diff --git a/src/db/CapacitorStorage.php b/src/db/CapacitorStorage.php
index 276a1b5..5be8f83 100644
--- a/src/db/CapacitorStorage.php
+++ b/src/db/CapacitorStorage.php
@@ -1,9 +1,7 @@
 <?php
 namespace nur\sery\db;
 
-use nur\sery\A;
 use nur\sery\cl;
-use nur\sery\str;
 
 /**
  * Class CapacitorStorage: objet permettant d'accumuler des données pour les
diff --git a/src/db/mysql/MysqlStorage.php b/src/db/mysql/MysqlStorage.php
index cf8df02..649b0b7 100644
--- a/src/db/mysql/MysqlStorage.php
+++ b/src/db/mysql/MysqlStorage.php
@@ -68,7 +68,7 @@ class MysqlStorage extends CapacitorStorage {
     $now = date("Y-m-d H:i:s");
     $row = cl::merge(
       $channel->getSum("item", $item),
-      $this->unserialize($channel, $channel->getItemValues($item)));
+      $this->serialize($channel, $channel->getItemValues($item)));
     $prow = null;
     $rowIds = $this->getRowIds($channel, $row, $primaryKeys);
     if ($rowIds !== null) {
diff --git a/src/db/sqlite/SqliteStorage.php b/src/db/sqlite/SqliteStorage.php
index 6c69c4a..c54e749 100644
--- a/src/db/sqlite/SqliteStorage.php
+++ b/src/db/sqlite/SqliteStorage.php
@@ -66,7 +66,7 @@ class SqliteStorage extends CapacitorStorage {
     $now = date("Y-m-d H:i:s");
     $row = cl::merge(
       $channel->getSum("item", $item),
-      $this->unserialize($channel, $channel->getItemValues($item)));
+      $this->serialize($channel, $channel->getItemValues($item)));
     $prow = null;
     $rowIds = $this->getRowIds($channel, $row, $primaryKeys);
     if ($rowIds !== null) {
diff --git a/tests/db/sqlite/SqliteStorageTest.php b/tests/db/sqlite/SqliteStorageTest.php
index 33fdac1..719528e 100644
--- a/tests/db/sqlite/SqliteStorageTest.php
+++ b/tests/db/sqlite/SqliteStorageTest.php
@@ -77,8 +77,8 @@ class SqliteStorageTest extends TestCase {
     };
     $capacitor->each(["age" => [">", 10]], $setDone, ["++"]);
     $capacitor->each(["done" => 0], $setDone, null);
-    Txx(cl::all($capacitor->discharge(false)));
 
+    Txx(cl::all($capacitor->discharge(false)));
     $capacitor->close();
     self::assertTrue(true);
   }
@@ -110,4 +110,42 @@ class SqliteStorageTest extends TestCase {
     $capacitor->close();
     self::assertTrue(true);
   }
+
+  function testSum() {
+    $storage = new SqliteStorage(__DIR__.'/capacitor.db');
+    $capacitor = new Capacitor($storage, new class extends CapacitorChannel {
+      const NAME = "sum";
+      const COLUMN_DEFINITIONS = [
+        "a__" => "varchar",
+        "b__" => "varchar",
+        "b__sum_" => self::SUM_DEFINITION,
+      ];
+
+      function getItemValues($item): ?array {
+        return [
+          "a" => $item["a"],
+          "b" => $item["b"],
+        ];
+      }
+    });
+
+    $capacitor->reset();
+    $capacitor->charge(["a" => null, "b" => null]);
+    $capacitor->charge(["a" => "first", "b" => "second"]);
+
+    Txx("=== all");
+    /** @var Sqlite $sqlite */
+    $sqlite = $capacitor->getStorage()->db();
+    Txx(cl::all($sqlite->all([
+      "select",
+      "from" => $capacitor->getChannel()->getTableName(),
+    ])));
+    Txx("=== each");
+    $capacitor->each(null, function ($item, $values) {
+      Txx($values);
+    });
+
+    $capacitor->close();
+    self::assertTrue(true);
+  }
 }
diff --git a/tests/php/content/contentTest.php b/tests/php/content/contentTest.php
index e77816b..bf824ba 100644
--- a/tests/php/content/contentTest.php
+++ b/tests/php/content/contentTest.php
@@ -1,7 +1,6 @@
 <?php
 namespace nur\sery\php\content;
 
-use nur\sery\php\content\content;
 use nur\sery\php\content\impl\html;
 use PHPUnit\Framework\TestCase;
 
diff --git a/tests/php/content/impl/AStaticContent.php b/tests/php/content/impl/AStaticContent.php
index 2436a11..cebc4fc 100644
--- a/tests/php/content/impl/AStaticContent.php
+++ b/tests/php/content/impl/AStaticContent.php
@@ -2,7 +2,6 @@
 namespace nur\sery\php\content\impl;
 
 use nur\sery\php\content\IStaticContent;
-use nur\sery\php\content\impl\html;
 
 class AStaticContent implements IStaticContent {
   function getContent(): iterable {
diff --git a/tests/php/content/impl/html.php b/tests/php/content/impl/html.php
index af9dc95..86eeca7 100644
--- a/tests/php/content/impl/html.php
+++ b/tests/php/content/impl/html.php
@@ -1,8 +1,6 @@
 <?php
 namespace nur\sery\php\content\impl;
 
-use nur\sery\php\content\impl\ATag;
-
 class html {
   const H1 = [self::class, "h1"];
   const DIV = [self::class, "div"];
diff --git a/tests/php/funcTest.php b/tests/php/funcTest.php
index ae70b67..9096a79 100644
--- a/tests/php/funcTest.php
+++ b/tests/php/funcTest.php
@@ -13,6 +13,7 @@ namespace {
 }
 
 namespace nur\sery\php {
+
   use nulib\tests\TestCase;
 
   class funcTest extends TestCase {