Make sure we properly deference everything for Avro and BSON #307

Job	Run time
windows-msvc (CBOR)	8m 37s
windows-msvc (JSON)	10m 47s
windows-msvc (CAPNPROTO)	8m 30s
windows-msvc (UBJSON)	7m 6s
windows-msvc (AVRO)	7m 38s
windows-msvc (benchmarks)	47m 54s
windows-msvc (XML)	4m 10s
windows-msvc (PARQUET)	36m 2s
windows-msvc (FLEXBUFFERS)	5m 24s
windows-msvc (MSGPACK)	3m 57s
windows-msvc (TOML)	4m 14s
windows-msvc (YAML)	3m 53s
windows-msvc-shared (JSON)	9m 44s
windows-msvc-shared (FLEXBUFFERS)	5m 13s
windows-msvc-shared (TOML)	4m 5s
windows-msvc-shared (PARQUET)	38m 8s
windows-msvc-shared (UBJSON)	7m 14s
windows-msvc-shared (CAPNPROTO)	7m 30s
windows-msvc-shared (AVRO)	7m 17s
windows-msvc-shared (MSGPACK)	5m 44s
windows-msvc-shared (CBOR)	8m 18s
windows-msvc-shared (XML)	4m 12s
windows-msvc-shared (YAML)	4m 31s
	4h 10m 8s

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