Revert "sequences: change map-integers to require fixnum length."
Revert "sequences: change map-integers to require fixnum length."

This reverts commit 0f71db0c9716682bedf3d7b260e8b0ea5993bfc0.

mcandre/factor,mcandre/factor,mcandre/factor,mcandre/factor,mcandre/factor,mcandre/factor,mcandre/factor