Here are two images. The first one was taken in Sublime Text 3. I’ve increased the font size a lot so it’s clear that the squareness of the colons is not an aliasing issue.

The second one was taken in iTerm2.
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You may have to zoom in to see, but the Sublime Text image has square colon dots, but the iTerm version has rounded ones. Actually, the colons for Ubuntu Mono are rounded in every other program on my Mac, but not Sublime Text 3.
Here are my font options:
"font_face": "Ubuntu Mono",
"font_options":
[
"gray_antialias"
],
"font_size": 11,
Any idea how to make the colons rounded in Sublime Text?
OS: OS X High Sierra
Build: 3Dev 3155. (I’m not on the latest version of dev because of the selection issue with the command palette.)