StepColormap: inclusive lower bound #141
Merged
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I wrote some simple tests to verify #134.
Found that the LinearColormap already works as expected.
Stepcolormap is not exactly broken at the moment, but weird in that the lower value of each bound is exclusive. Confusing, because the first value in the index is inclusive. And it's probably more conventional to have the lower value be inclusive and the upper value be exclusive.
I've made a new PR over #134 because these tests are important, we don't have to change LinearColormap, the change to StepColormap is smaller and updated the docstring.