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aee1687215
The new RNG wraps up state for random number generation, so one can have many rngs and even marshal and unmarshal them. Adds math/rng, math/rng-uniform, and math/rng-int. Also introduce `in` and change semantics for indexing out of range. This commit enforces stricter invariants on keys when indexing via a function call on the data structure, or the new `in` function. The `get` function is now more lax about keys, and will not throw an error when a bad key is used for a data structure, instead returning the default value.