Distinguish U+021A from U+0162 and U+021B from U+0163

[maxthomax]

Problem

• Uppercase: the character for U+021A (Latin capital letter T with comma below) looks at the moment like U+0162 (Latin capital letter T with cedilla);
• Lowercase: the character for U+021B (Latin small letter t with comma below) looks at the moment like U+0163 (Latin small letter t with cedilla).

Details

• Found on the Font Playground (https://sourcefoundry.org/hack/playground.html) on 2019-09-09, viewed with 'Chromium Version 76.0.3809.100 (Official Build) Built on Ubuntu' and 'Firefox Quantum 69.0 (64-bit)', running on Ubuntu 19.04 (64-bit);
• Relation to the Design Targets: non-ASCII, not subjective, multiple (all?) font-sizes, cross-platform.
• Evidence:

Proposed Solution

I propose to have the "comma below" implemented like it has already been done for the related characters U+0218 (Latin capital letter S with comma below) and U+0219 (Latin small letter s with comma below).

Context

The "with cedilla" version started to be used instead of the "with comma" by necessity, in the times before the "with comma" version was included into fonts and into Unicode.

This change would help align the 'Hack' font with Unicode by using glyphs which correspond to the descriptions of the character codes.

References

See the References and External links from https://en.wikipedia.org/wiki/T-comma.