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+m4_dnl To avoid annoying conflicts with quote characters, use
+m4_dnl U+2068 FIRST STRONG ISOLATE and U+2069 POP DIRECTIONAL ISOLATE
+m4_changequote(⁨,⁩)
+
+m4_dnl We also need to avoid the comment character ever doing absolutely
+m4_dnl anything, so set it to U+FFFD REPLACEMENT CHARACTER
+m4_changecom(�)