Noto San's U+036c (phi, curly) renders identically to U+035d (phi, straight line)

[thanatos]

Defect Report

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Title

The characters U+036c (φ) & U+035d (ϕ) render identically.

Font

"Noto Sans Regular" is what FF says upon inspection; same with gucharmap.

Full file name, for example 'NotoSansArmenian-Regular.ttf'. You can upload the problem font here unless it is a Chinese, Japanese or Korean font (these are large).

Where the font came from, and when

The noto-fonts 20220502-3 package in Arch, I think.

Font Version

• Mac - right mouse click on a font and try Preview to see version info.
• Win -- right mouse click on a font (Local Disc > Windows > Fonts) and see version info on Properties.
• Linux -- use (Gnome) Font Viewer: open a font and click on Info tab.

OS name and version

Arch Linux

Application name and version

Firefox, Discord

Issue

The character U+036c renders identically to U+035d; both are a Greek lowercase phi, but U+036c, I think, should include a "tail". Vs. U+035d, which looks like a "o" with a "|" through it. However, note that I am not a Greek speaker, native or otherwise.

See, for example, the renderings in https://www.unicode.org/charts/PDF/U0370.pdf

See also the Wikipedia article for phi; that article includes the sentence:

The lowercase letter φ (or often its variant, ϕ)

That renders as,

comparison with non-Noto fonts

As I type this into Github, which uses Nimbus,

… you can see that font differentiates the two.

Character data

Please include real character data to illustrate your issue-- Unicode codepoints are helpful. This makes it possible for developers who don't know the language or script to copy/paste the text to reproduce the issue.

Screenshot

(Inlined above.)

Tools for reporting bugs

Useful tools for reporting bugs are available at: https://github.com/googlei18n/

Harfbuzz hb-view and hb-shape

hb-view /usr/share/fonts/noto/NotoSans-Medium.ttf --text='φϕ' --output-file sample-noto.png

» hb-shape /usr/share/fonts/noto/NotoSans-Medium.ttf --text='φϕ'            
[phi=0+751|uni03D5=1+751]

Fontview

• Fontview displays the text.

Fontdiff

• Fontdiff displays the text using two versions of the font side by side.

[thanatos]

(Sorry, hit a firefox bug & wanted to submit this to not lose it. There's a few bits I want to fill out still, namely the HB renderings.)

[thanatos]

I can't find just plain old Noto Sans on the Noto Dashboard; if I could, I would download that & render w/ HB, just to be sure this isn't already fixed. Nor does this repo appear to have anything relevant in "Releases".

I downloaded this NotoSans-Regular.ttf, which at the time of writing, is HEAD of main; it has the same issues as in the bug above.