No styling in Bulgarian, Macedonian, or Serbian

[dscorbett]

• Your font version: 3.0.0-rc.8
• Your font variant: Iosevka Extended
• Your operating system (name and version): macOS 10.14.6
• Your application using Iosevka: hb-view

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Only the default style is available in text tagged as Bulgarian, Macedonian, or Serbian. That is because the font includes the language system tags 'BGR ', 'MKD ', and 'SRB ' but only uses them with the 'locl' features. All other lookups use only 'dflt', which excludes those three. For example, here is ⟨д0⟩ with 'ss01' in no language:

and ⟨д0⟩ with 'ss01' in Bulgarian:

[be5invis]

Fixed.