Quotes appear as digits 8 and 9 on OS X Yosemite in some cases

[Joel]

Suppose I use the Ubuntu Regular font, any point size on OS X in any of the following popular programs:

Pages (word processor by Apple)
TextEdit (simpler text editor, by Apple)
Sketch (popular design app for UI design by Bohemian Coding)

Then, if I type anything like the following code using the Ubuntu Regular font:

{
    "city_id" : "{request.url.city_id}"
}

then the Ubuntu Regular font instead uses 8 for the opening quote and 9 for the closing quote, so it looks like

{
    8city_id9: 8{request.url.city_id}9
}

except that the 8 and 9 are "superscripted" in their vertical placement, exactly where the real quotes should go.

Since this happens on so many major and well-tested apps on OS X, I strongly suspect that the bug is with the Ubuntu Regular font itself, or with its interaction with the OS X font system.

Please see the attached screenshots.

Thanks

[Joel (iosdev)]

More evidence that this is not just constrained to OS X or Pages:

Tiny MCE editor and WordPress:
https://wordpress.org/support/topic/apostrophe-appearing-as-superscript-9-in-tinymce-editor

Issue with smart quotes might be the problem:
https://discussions.apple.com/thread/6510381?start=0&tstart=0

[Joel (iosdev)]

I just confirmed that in Pages doing the following temporarily fixes the problem:

Edit => Substitutions => Ensure Smart Quotes is turned off

However, this is only a temporary fix and the issue is clearly smart quotes in the font and potential Unicode non-compliance of the font.

[Adolfo Jayme Barrientos (fitojb)]

Thank you for your report. This is a known problem, please see bug 1334363 which is an earlier report describing this issue. Feel free to add comments there if you want to add something.

[Paul Sladen (sladen)]

Joel: your analytical skills would be really appreciated in narrowing down some precise testcases.