Re: htmlescape: inconsistency between _py_htmltext and _c_htmltext

Speaking of htmltext and subclassing, a while back I experimented with
making htmltext a subclass of str.  I seem to recall it worked fine
and eliminated my problems of forgetting to wrap string literals with
str() in html templates.

I forget the rationale behind not making htmltext a subclass of str,
but in case it was that builtin-type subclassing is new and scary,
maybe it's not so new anymore?