Quote from Target's explanation of stats post:

Unroutable:
Doesn't actually make them "unroutable", but actually flags them as samurai in the code which makes the honourable, meaning they get bonuses in their routing check codes. Ashigaru and Mongols are basically peasants and rabble, so they aren't given samurai status
true = 1, false = 0

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Lay your sleeping head, my love,
Human on my faithless arm;
Time and fevers burn away
Individual beauty from
Thoughtful children, and the grave
Proves the child ephemeral:
But in my arms till break of day
Let the living creature lie,
Mortal, guilty, but to me
The entirely beautiful.