diff --git a/Zend/zend_operators.h b/Zend/zend_operators.h
index 15ad79e4dbf..666a3ecd10e 100644
--- a/Zend/zend_operators.h
+++ b/Zend/zend_operators.h
@@ -789,6 +789,7 @@ static zend_always_inline int fast_mul_function(zval *result, zval *op1, zval *o
 
 static zend_always_inline int fast_div_function(zval *result, zval *op1, zval *op2 TSRMLS_DC)
 {
+#if 0
 	if (EXPECTED(Z_TYPE_P(op1) == IS_LONG) && 0) {
 		if (EXPECTED(Z_TYPE_P(op2) == IS_LONG)) {
 			if (UNEXPECTED(Z_LVAL_P(op2) == 0)) {
@@ -843,6 +844,7 @@ static zend_always_inline int fast_div_function(zval *result, zval *op1, zval *o
 			return SUCCESS;
 		}
 	}
+#endif
 	return div_function(result, op1, op2 TSRMLS_CC);
 }
 
diff --git a/ext/standard/tests/general_functions/var_export-locale.phpt b/ext/standard/tests/general_functions/var_export-locale.phpt
index 3cbebe9c723..b6f87c431c5 100644
--- a/ext/standard/tests/general_functions/var_export-locale.phpt
+++ b/ext/standard/tests/general_functions/var_export-locale.phpt
@@ -1,7 +1,7 @@
 --TEST--
 Test var_export() function with locale
 --INI--
-precision=14
+serialize_precision=17
 --SKIPIF--
 <?php
 if (!setlocale(LC_ALL, "german", "de","de_DE","de_DE.ISO8859-1","de_DE.ISO_8859-1","de_DE.UTF-8")) {
diff --git a/ext/standard/tests/general_functions/var_export_basic3.phpt b/ext/standard/tests/general_functions/var_export_basic3.phpt
index 9e27d904258..58c04481679 100644
--- a/ext/standard/tests/general_functions/var_export_basic3.phpt
+++ b/ext/standard/tests/general_functions/var_export_basic3.phpt
@@ -1,7 +1,7 @@
 --TEST--
 Test var_export() function with valid float values
 --INI--
-precision=14
+serialize_precision=17
 --FILE--
 <?php
 /* Prototype  : mixed var_export(mixed var [, bool return])
diff --git a/ext/standard/tests/general_functions/var_export_basic5.phpt b/ext/standard/tests/general_functions/var_export_basic5.phpt
index 1512fa8377b..dacb3553230 100644
--- a/ext/standard/tests/general_functions/var_export_basic5.phpt
+++ b/ext/standard/tests/general_functions/var_export_basic5.phpt
@@ -1,5 +1,7 @@
 --TEST--
 Test var_export() function with valid arrays
+--INI--
+serialize_precision=17
 --FILE--
 <?php
 /* Prototype  : mixed var_export(mixed var [, bool return])
diff --git a/ext/standard/tests/serialize/serialization_error_002.phpt b/ext/standard/tests/serialize/serialization_error_002.phpt
new file mode 100644
index 00000000000..6b4f6e376b7
--- /dev/null
+++ b/ext/standard/tests/serialize/serialization_error_002.phpt
@@ -0,0 +1,52 @@
+--TEST--
+Test unserialize(): error is indistinguishable from deserialized boolean
+--FILE--
+<?php
+/* Prototype  : proto string serialize(mixed variable)
+ * Description: Returns a string representation of variable (which can later be unserialized)
+ * Source code: ext/standard/var.c
+ * Alias to functions:
+ */
+/* Prototype  : proto mixed unserialize(string variable_representation)
+ * Description: Takes a string representation of variable and recreates it
+ * Source code: ext/standard/var.c
+ * Alias to functions:
+ */
+
+echo "*** Testing unserialize() error/boolean distinction ***\n";
+
+$garbage = "obvious non-serialized data";
+$serialized_false = serialize(false);
+
+var_dump($serialized_false);
+
+$deserialized_garbage = unserialize($garbage);
+var_dump($deserialized_garbage);
+
+$deserialized_false = unserialize($serialized_false);
+var_dump($deserialized_false);
+
+echo "unserialize error and deserialized false are identical? " . (bool) ($deserialized_false == $deserialized_garbage) . "\n";
+
+// candidate safe idiom for determining whether data is serialized
+function isSerialized($str) {
+    return ($str == serialize(false) || @unserialize($str) !== false);
+}
+
+// Test unserialize error idiom
+var_dump(isSerialized($garbage));
+var_dump(isSerialized($serialized_false));
+
+echo "Done";
+?>
+--EXPECTF--
+*** Testing unserialize() error/boolean distinction ***
+string(4) "b:0;"
+
+Notice: unserialize(): Error at offset 0 of 27 bytes in %s/serialization_error_002.php on line 20
+bool(false)
+bool(false)
+unserialize error and deserialized false are identical? 1
+bool(false)
+bool(true)
+Done
diff --git a/tests/lang/bug24640.phpt b/tests/lang/bug24640.phpt
index e41d0201b77..d02889101e6 100644
--- a/tests/lang/bug24640.phpt
+++ b/tests/lang/bug24640.phpt
@@ -2,6 +2,7 @@
 Bug #24640 (var_export and var_dump can't output large float)
 --INI--
 precision=12
+serialize_precision=17
 --FILE--
 <?php
 function test($v)