WIP: Moving internals from Vec to Cow (Starting point for discussion) #286
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Fixes #285
This will allow for const creation of BigUint etc.
I started off by just doing BigUint to give an idea of what it would take. Please use this as a starting off point for discussion.
Right now I'm not looking for optimization, but just the bare minimum.
If you have a static borrow and something in the original code calls a mut method, a copy will be made, regardless of whether the mut method would have actually changed the contents of the Vec or not.