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This test sends a single trace many times to the encoder. Each trace is pre-formatted (as the encoder requires) and consists of 30 spans with the same content in each of them. The IDs are all randomized. A null writer is provided to the encoder, so writing operations are not included here.

The span content contains three metas, three metrics, and reasonable values for everything else.

The two variants correspond to the v0.4 and v0.5 encoders.