First reported by @programflex in https://github.com/plotly/plotly.js/issues/475#issuecomment-225803112
Reproducible example: http://codepen.io/etpinard/pen/bepzRm
May be related to https://github.com/plotly/plotly.js/issues/627
cc @keeganmccallum
Looking into, issue seems to be that -0 === 0, will make a pull request shortly
@keeganmccallum You're the man!
will be fixed in fix-bar-relative-first-bucket.
Most helpful comment
Looking into, issue seems to be that -0 === 0, will make a pull request shortly