* Register additional handlers from wrappers
* Return zval instead of parse frame
* Use parse frame
* Update upb
* Lazily create wrapper messages
* Fix a segment fault
Need check type of field before getting submsg def
* Avoid expanding during serialization and direct access
* Fix a bug that getXXXUnwrapped returns null for string
* Implement writeWrapperUnwrapped
* Add more tests
* Fix oneof wrapper parsing
* Fix get oneof field
* Avoid expansion for oneof wrappers
* Fix bug
* Fix a bug that in php7 variable is defined out of scope
* Fix broken tests
* Update upb to fix Timestamp conformance tests
* Fix segmentation fault for oneof wrapper fields
* Fix encoding/decoding top level wrapper values
* Add type checking for write wrapper value in php7
* Fix zts build
* Fix the bug that readWrapperValue uses parent message's layout to access wrapper value
* Fix wrapper in map
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