=> generic UTF8 LATIN1 cp :fast safe
\p{VertSpace}
+REPLACEMENT: Unicode REPLACEMENT CHARACTER
+=> UTF8 :safe
+0xFFFD
+
+NONCHAR: Non character code points
+=> UTF8 :fast
+\p{Nchar}
+
+SURROGATE: Surrogate characters
+=> UTF8 :fast
+\p{Gc=Cs}
+
GCB_L: Grapheme_Cluster_Break=L
=> UTF8 :fast
\p{_X_GCB_L}