Bijou64: 可変長整数エンコーディング
Bijou64は、数値のサイズに応じてバイト数を変える可変長整数エンコーディング方式。値が小さいほど短いバイト列で表現できるため、多くの数値が小さな値であるデータの効率的な圧縮に適している。
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