`exponentformat` of 'E' does not work with log scaling

[jacobq]

When using layout.yaxis.type = 'log' the layout.yaxis.exponentformat parameter works with SI, power, and none, but setting to e or E triggers the power behavior.

See example here

[alexcjohnson]

Ha, we're explicit in the code about treating these the same:

plotly.js/src/plots/cartesian/axes.js

Line 1103 in f996446

if(['e', 'E', 'power'].indexOf(ax.exponentformat) !== -1 ||

But you're right, that's weird. Should be an easy add.

[jacobq]

Thanks for investigating (I probably ought to have at least grepped for exponentformat). It's not a huge deal (and I personally think the power format looks nice), but my client specifically requested that I show these values in xE+x format 🤷‍♂️ .