Allow support for atomic variables; resolves #575 #438

Job	Run time
windows-msvc-shared (CAPNPROTO)	7m 44s
windows-msvc-shared (FLEXBUFFERS)	5m 43s
windows-msvc-shared (CBOR)	8m 30s
windows-msvc-shared (PARQUET)	41m 34s
windows-msvc-shared (JSON)	11m 20s
windows-msvc-shared (TOML)	4m 16s
windows-msvc-shared (MSGPACK)	4m 14s
windows-msvc-shared (XML)	4m 43s
windows-msvc-shared (UBJSON)	6m 53s
windows-msvc-shared (AVRO)	8m 49s
windows-msvc-shared (YAML)	4m 26s
windows-msvc (YAML)	5m 1s
windows-msvc (CAPNPROTO)	7m 55s
windows-msvc (PARQUET)	39m 35s
windows-msvc (JSON)	10m 59s
windows-msvc (AVRO)	7m 12s
windows-msvc (XML)	3m 47s
windows-msvc (benchmarks)	46m 48s
windows-msvc (MSGPACK)	4m 31s
windows-msvc (TOML)	3m 44s
windows-msvc (UBJSON)	7m 41s
windows-msvc (CBOR)	8m 32s
windows-msvc (FLEXBUFFERS)	5m 26s
	4h 19m 23s

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