Instance for Double/Float is absolutely batty

Apparently, binary represents a Double as a tuple of (Integer, Int)? This means that doubles suffer a x3 or more size explosion, when really you could just record an IEEE floating point with the proper endian. This would also fix #64

Backwards compatibility might be a concern for fixing this, however.

首先定位 Haskell Instance for Double/Float，并阅读 issue #64 的讨论。在评估提议的 IEEE 浮点表示之前，检查当前的编码表示以及现有的所有测试。完成的标准是已处理大小扩展问题、已覆盖 #64，并且已测试向后兼容性影响或明确解决该问题。

由索引模型根据 Issue 内容生成。