It is possible to do integer scrolling on tilemaps but as Gabriel says the internal values must be floats and then rounded to ints. You shouldn't get gaps unless something is going wrong with your code. Integers won't look that smooth though. Floating point will be smoother but will have "artifacts" on the edges of the tiles until I (or Indiepath or someone else) sorts out some easy to use mesh code.
Delta timing and tile scrolling
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