There's an inconsistency between the definitions of htmlescape() in the
Python and C versions. The Python version uses "isinstance(s, htmltext)"
to test for htmltext instances. The C version uses "((v)->ob_type ==
&htmltext_Type)" which mirrors the old "classof(s) is htmltext"
behaviour. Thus, the C implementation does not recognize subclasses of
htmltext.
To allow for htmltext subclasses to work as expected, could
_c_htmltext.c be modified so that:
#define htmltextObject_Check(v) ((v)->ob_type == &htmltext_Type)
is replaced with
#define htmltextObject_Check(v) (PyType_IsSubtype((v)->ob_type,
&htmltext_Type))
Thanks,
Graham
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