Index: class.ux_t3lib_db.php
===================================================================
--- class.ux_t3lib_db.php	(revision 26342)
+++ class.ux_t3lib_db.php	(working copy)
@@ -766,7 +766,11 @@
 						// Add slashes old-school:
 						// cast numerical values
 					$mt = $this->sql_field_metatype($table, $k);
-					$v = (($mt{0} == 'I') || ($mt{0} == 'F')) ? (int)$v : $v;
+					if ($mt{0} == 'I') {
+						$v = (int)$v;
+					} else if ($mt{0} == 'F') {
+						$v = (double)$v;
+					}
 
 					$nArr[$this->quoteFieldNames($k)] = (!in_array($k,$no_quote_fields)) ? $this->fullQuoteStr($v, $table) : $v;
 				}
@@ -837,7 +841,11 @@
 							// Add slashes old-school:
 							// cast numeric values
 						$mt = $this->sql_field_metatype($table, $k);
-						$v = (($mt{0} == 'I') || ($mt{0} == 'F')) ? (int)$v : $v;
+						if ($mt{0} == 'I') {
+							$v = (int)$v;
+						} else if ($mt{0} == 'F') {
+							$v = (double)$v;
+						}
 						$nArr[] = $this->quoteFieldNames($k) . '=' . ((!in_array($k, $no_quote_fields)) ? $this->fullQuoteStr($v, $table) : $v);
 					}
 				}
Index: tests/db_general_testcase.php
===================================================================
--- tests/db_general_testcase.php	(revision 26344)
+++ tests/db_general_testcase.php	(working copy)
@@ -100,5 +100,39 @@
 		$expected .= ' AND sys_refindex.ref_string LIKE CONCAT(tx_dam_file_tracking.file_path,tx_dam_file_tracking.file_name)';
 		$this->assertEquals($expected, $query);
 	}
+
+	/** 
+	 * @test
+	 * @see http://bugs.typo3.org/view.php?id=10965
+	 */
+	public function floatNumberCanBeStoredInDatabase() {
+			// Prepare a fake extension configuration
+		$ext_tables = t3lib_div::tempnam('ext_tables');
+		t3lib_div::writeFile($ext_tables, '
+			CREATE TABLE tx_test_dbal (
+				foo double default \'0\',
+				foobar integer default \'0\'
+			);
+		');
+
+		$GLOBALS['TYPO3_LOADED_EXT']['test_dbal'] = array(
+			'ext_tables.sql' => $ext_tables
+		);
+
+			// Append our test table to the list of existing tables
+		$this->fixture->clearCachedFieldInfo();
+		$this->fixture->_call('initInternalVariables');
+
+		$data = array(
+			'foo'    => 99.12,
+			'foobar' => -120,
+		);
+		$query = $this->cleanSql($this->fixture->INSERTquery('tx_test_dbal', $data));
+		$expected = 'INSERT INTO tx_test_dbal ( foo, foobar ) VALUES ( \'99.12\', \'-120\' )';
+		$this->assertEquals($expected, $query);
+
+			// Remove temporary file
+		unlink($ext_tables);
+	}
 }
 ?>
\ No newline at end of file