fix: use size estimation for page deduction

Author: dranikpg

src/core/compact_object.cc

@@ -694,7 +694,6 @@ void RobjWrapper::ReallocateString(MemoryResource* mr) {
 void RobjWrapper::Init(unsigned type, unsigned encoding, void* inner) {
   type_ = type;
   encoding_ = encoding;
-  CHECK(inner != nullptr);
   Set(inner, 0);
 }
 

src/server/tiered_storage.cc

@@ -528,7 +528,8 @@ void TieredStorage::CancelStash(DbIndex dbid, std::string_view key, PrimeValue*
   if (auto node = stash_backpressure_.extract(make_pair(dbid, key)); !node.empty())
     std::move(node.mapped()).Resolve(false);
 
-  if (OccupiesWholePages(value->Size())) {
+  auto estimated = EstimateSerializedSize(*value);
+  if (OccupiesWholePages(estimated->first)) {
     op_manager_->Delete(KeyRef(dbid, key));
   } else if (auto bin = bins_->Delete(dbid, key); bin) {
     op_manager_->Delete(*bin);