* Test singular fields are encoded in canonical way
* Defautl values in proto3 should not be encoded.
* Values should be converted to the canonical representation (e.g.,
long int64 value may be truncated for int32 field)
* Update failure list
* Update failure list
* Add conformance tests for explicit packed/unpacked fields
* Fix typo
* Update failure lists
* Update failure list
* Use enum class to make enum scoped
* Add binary conformance test for default repeated fields
1) Both packed and unpacked encoding should be accepted for parsing.
2) Encode should follow the default way for the syntax.
* Uncomment test
* Remove is_primitive
* Add failed tests to failure lists.
* Add failed test to failure list
* Use binary format to specify expected value
Text format cannot distinguish whether repeated field is packed or not.
* Change method name from ToHexString to ToOctString
* Add failed test to failure list
* Add failed test to php's failure list
* Fix comments
If a message is proto3, then the zero values still count as being set one the
field is in a oneof.
Add tests to confirm oneofs work as expected in both syntaxes.
- Update all the new runner cases to handle a skip result as a skip and not a failure.
- Make ObjC use the new serialize_error result if it fails to generate the data.
