refactor: 0 pair 0 meld's replacement number and necessary tiles fixed to 0 #31
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0 雀頭 0 面子の部分置換数は常に 0、有効牌はなしとなる。
そのため、pack した置換数と有効牌を unpack する際 pack[0] を参照する必要はなく、常に 0 としてよい。
これにより実行時の計算時間がわずかに減少する。
Criterion.rs のベンチマークでは変更前と比べて 0.6 % ~ 6.3 % 減少している。