Integer bins via rounding

Just a first pass at doing integer binning via rounding the edges and passing those into the histogram function. In a situation like [25, 81], this will result in 10 bins with a per-bin width of either 5 or 6. If people aren't fans of this, that's totally fine.

I assume I'm doing plenty wrong, too. Please tear me apart!
If there are just some nulls, it'd be better to filter them out than to make the column entirely unchartable if a null exists in it (also may want to filter for undefined and NaN while you're at it).