[IMPROVED] Last msg lookup (KV Get) when subject is a literal subject #4232
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When messages were very small and the key space was very large the performance of last message gets in the store layer (both file and memory) would degrade.
If the subject is literal we can optimize and avoid sequence scans that are needed when multiple subject states need to be considered.
Signed-off-by: Derek Collison derek@nats.io
Resolves #4221