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--- lib/prawn/font.rb.orig	2018-11-08 20:45:32.309671191 +0000
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+++ lib/prawn/font.rb	2018-11-08 20:46:17.537133702 +0000
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@@ -384,7 +384,7 @@
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     end
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     def identifier_for(subset) #:nodoc:
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-      "#{@identifier}.#{subset}"
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+      "#{@identifier}.#{subset}".to_sym
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     end
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     def inspect #:nodoc: