Bug report

Bug summary

Edgecolor argument to the bar() method (either matplotlib.axes.axes.bar() or matplotlib.pyplot.bar()) when set to a scalar, applies only to the first bar, but not to the rest. See the code below.

Code for reproduction

plt.bar([1,2,3], [20,30,40], edgecolor='0', linewidth=2)

If I change it to:

plt.bar([1,2,3], [20,30,40], edgecolor=['0', '0', '0'], linewidth=2)

it works, and I get all the edgelines as expected.

Actual outcome

Screenshot: https://imgur.com/a/zQTSS

Expected outcome

The expected outcome is that all bars have the same edgecolors and linewidths (when set to a scalar).
It worked on matplotlib 2.0.0, but stopped working on 2.1.0 version.

Matplotlib version

• Operating system: Linux 3.14.79-27-ARCH
• Matplotlib version: 2.1.0
• Matplotlib backend: module://ipykernel.pylab.backend_inline
• Python version: Python 3.6.3, [GCC 7.2.0] on linux
• Jupyter version (if applicable): jupyter-client 5.1.0, jupyter-console 5.2.0, jupyter-core 4.4.0
• Other libraries:

Matplotlib was installed from ALARM repository (Arch Linux ARM, python-matplotlib package).