.sharedna:
When two bots are tied and share DNA, both DNA are run for each bot behaviour.
That is, if you got one bot that reproduces, and another that fires, they'll both reproduce and fire, tho the copies will only inherit the parent's DNA.
The value stored is the weight of the bot DNA. The DNA with lower weight is run first, and its actions may be overridden by the more weightful DNA. For more than two bots, the tie to the bot with higher weight is the one that runs the shared DNA