leak_safe -> defaults

Author: hershel-theodore-layton

tests/GivenASpread/GivenASpreadOfSpecialUntypedSetAttributeToATagWithTheSameAttributeButWithATypeTest.hack

@@ -7,7 +7,7 @@ use function HTL\Expect\expect;
 <<TestChain\Discover>>
 function given_a_spread_of_special_untyped_set_attribute_to_a_tag_with_the_same_attribute_but_with_a_type_test(
   TestChain\Chain $chain,
-)[leak_safe]: TestChain\Chain {
+)[defaults]: TestChain\Chain {
   return $chain->group(__FUNCTION__)
     ->test(
       'test_the_explicitly_set_value_is_spread_even_though_this_might_set_a_value_of_a_different_type',

tests/SuccessorFlowTest.hack

@@ -99,7 +99,7 @@ final class Immediate extends SGMLStream\SimpleElement {
   <<__Override>>
   public function processSuccessorFlow(
     SGMLStreamInterfaces\Successor<SGMLStreamInterfaces\WritableFlow> $flow,
-  )[leak_safe]: void {
+  )[defaults]: void {
     $flow->declareConstant(
       '!'.$this->:number,
       clock_gettime_ns(CLOCK_MONOTONIC),