[DejaVu-bugs] [Bug 106890] New: Some glyphs of the phonetic notations in the International Phonetic Alphabet are not designed correctly

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106890

            Bug ID: 106890
           Summary: Some glyphs of the phonetic notations in the
                    International Phonetic Alphabet are not designed
                    correctly
           Product: DejaVu
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Sans
          Assignee: dejavu-bugs at lists.freedesktop.org
          Reporter: urzjs3hakj9iz8 at secmail.pro

According to the International Phonetic Association, some glyphs of the
phonetic notations of the International Phonetic Alphabet in DejaVu Sans font
are not designed correctly:
https://www.internationalphoneticassociation.org/content/full-ipa-chart

Quotation:

• The symbol for the labiodental flap [ⱱ, Unicode: U+2C71] is not quite right
in this font (and in many fonts). We recommend using the symbol from another
sans serif font, SIL’s Andika, for this symbol.
• The symbol for the alveolar tap [ɾ, Unicode: U+027E] has a serif. This makes
the shape more clearly different from the trill symbol. However, if a sans
serif symbol is desired, the tap symbol from SIL’s Andika font can be used.
• The symbol for the voiced palatal implosive [ʄ, Unicode: U+0284] in this font
has an extra half cross-bar, above the full cross-bar. Therefore the symbol
shown here is made by combining 0283+0335.
• The Laminal diacritic [Unicode: U+033B] is square and small, and therefore
tends to be confused with the voiceless diacritic [U+0325]. We recommend that
this diacritic be made extra-large so that its shape is clearly a square, not a
circle. (In IPA Kiel, this diacritic is correctly a rectangle.)
• The exact tone contour [˥, Unicode: U+02E5] shown in the Rising-falling tone
letter [˨˥˨, Unicode: 02E8 + 02E5 + 02E8] is different from IPA Kiel’s.
• The shape of the Velarized diacritic [ˠ, Unicode: U+02E0] is not quite the
same as that of the voiced velar fricative [ɣ, Unicode: U+0263].
• A problem for all fonts, due to the design of symbols introduced in 1989, is
that the distinctions between the dental click [ǀ, Unicode: U+01C0] and the
minor group [|, Unicode: U+007C], and between the lateral click [ǁ, Unicode:
U+01C1] and the major group [‖, Unicode: U+2016], are small at best. At the
time of the Kiel convention, it was suggested that the grouping symbols be
thicker than the click symbols. In the 2005 chart, the grouping symbols were in
bold, and that is true of the 2015 charts as well. In addition, in sans serif
fonts the alveolar lateral approximant is likely to be similar to both the
dental click and the minor group. DejaVu does a relatively good job of keeping
these distinct through line length and thickness.

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