I think the question was directed at TT users. At least mine was.
Flip HTML::Mason's default_escape_flags
That's the point. TT doesn't seem to have such a flag (or at least nobody knows about it). HTML::Template and HTML::Mason (documented in HTML::Mason::Compiler have some default escaping mechanism. So what do the TT users do?
I can't believe they never forget to escape something and therefore don't need a better solution.
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