1 - Fix to handle no-op escapes such as \\, broken by unicode fix
4 - Fix unicode/wide characters confusing the perl compiler
5 - Ensure TT doesn't try and call methods instead of VMethods
8 - Fix concatenating undef to HTML::String values.
11 - Fix concatenating strings that evaluate to false in a boolean context.
14 - Optimise _hsv_dot since it gets called heavily by HTML::String::TT
17 - Localize $@ in isa and can in case of modules that mishandle eval {}
18 - Support for single quotes (' to ')