Wrong histogram for a certain data point

[Pradhyo]

Instead of two bars, one at 4 and another at 1, there is only one single bar at 4 when I try to plot a histogram for just [4, 1]

Bug on Codepen

It plots correctly for [5, 1] and some other values I tried.

[alexcjohnson]

Thanks for the report - this seems to fail for a somewhat random set of [x, 1], including 8, 9, and 15-19 (and [1, x] fails the reverse way for the same numbers, only showing the 1).

[Pradhyo]

Thank you!