1360 - store doubles in memory

This is a far cleaner way to provide *some* floating-point support. We
can only represent signed integers up to 2^51 rather than 2^63. But in
exchange we don't have to worry about it elsewhere, and it's probably
faster than checking tag bits in every operation.

Hmm, yeah, surprised how easy this was. I think I'll give up on the
other approach.

I still don't have non-integer literals. But we won't bother with those
until we need them. `3.14159:literal` seems ugly.

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