exponentiation incorrect (bp #75)

[mergify]

This is an automatic backport of pull request #75 done by Mergify.

Cherry-pick of 991e763 has failed:

On branch mergify/bp/develop/pr-75
Your branch is up to date with 'origin/develop'.

You are currently cherry-picking commit 991e763.
  (all conflicts fixed: run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

nothing to commit, working tree clean

Cherry-pick of 87ee8e5 has failed:

On branch mergify/bp/develop/pr-75
Your branch is ahead of 'origin/develop' by 1 commit.
  (use "git push" to publish your local commits)

You are currently cherry-picking commit 87ee8e5.
  (all conflicts fixed: run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

nothing to commit, working tree clean

To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

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