fix: SQLite3 Forge::modifyColumn() changes numeric default value

See #8457 (comment)

Author: kenjis

system/Database/SQLite3/Table.php

@@ -399,7 +399,15 @@ protected function formatFields($fields)
                 // 'NULL' means that the default value is NULL.
                 $return[$field->name]['default'] = null;
             } else {
-                $return[$field->name]['default'] = trim($field->default, "'");
+                $default = trim($field->default, "'");
+
+                if ($this->isIntegerType($field->type)) {
+                    $default = (int) $default;
+                } elseif ($this->isNumericType($field->type)) {
+                    $default = (float) $default;
+                }
+
+                $return[$field->name]['default'] = $default;
             }
 
             if ($field->primary_key) {
@@ -413,6 +421,30 @@ protected function formatFields($fields)
         return $return;
     }
 
+    /**
+     * Is INTEGER type?
+     *
+     * @param string $type SQLite data type (case-insensitive)
+     *
+     * @see https://www.sqlite.org/datatype3.html
+     */
+    private function isIntegerType(string $type): bool
+    {
+        return strpos(strtoupper($type), 'INT') !== false;
+    }
+
+    /**
+     * Is NUMERIC type?
+     *
+     * @param string $type SQLite data type (case-insensitive)
+     *
+     * @see https://www.sqlite.org/datatype3.html
+     */
+    private function isNumericType(string $type): bool
+    {
+        return in_array(strtoupper($type), ['NUMERIC', 'DECIMAL'], true);
+    }
+
     /**
      * Converts keys retrieved from the database to
      * the format needed to create later.