Document encoding optimization

By sending encoded words rather than letters, we could speed up
English paging rate by 2.5x over an optimized implementation

Word-encoded implementation: 16 bits per word
(capped at 64k possible words).

Optimized char-based imlementation:
(5.7 chars per word) * (7 bits per char) == 39.9 bits per word
2.5x slower than word encoding.

Today's char-based implementation:
(5.7 chars per word) * (16 bits per char) == 91.2 bits per word
5.7x slower than word encoding.

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