[com.google.fonts/check/case_mapping] Only check letters

fonttools / fontbakery

🧁 A font quality assurance tool for everyone

https://fontbakery.readthedocs.io

Apache License 2.0

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Closed simoncozens closed 1 month ago

simoncozens commented 1 month ago

Relates to issue #4733; as per David Corbett's suggestion, we check for unicode category = "L*"