id	summary	reporter	owner	description	type	status	priority	milestone	component	resolution	keywords	cc
3	Cython calls ExtType.__init__() as Python function	robertwb	somebody	"When subclasses of extension types call the {{{__init__()}}} method of their supertype, Cython generates code that looks up the ""{{{__init__}}}"" attribute of the instance and then calls it through Python using arg tuple/kwargs. This is because the special {{{__init__()}}} method (""{{{tp_init}}}"" slot) uses this call signature.

Cython should recognise calls to this method and at least call it directly.

In the (presumably very common) case that the arguments do not use starargs, a more advanced approach would be to split the {{{__init__()}}} method into an internal plain C-function replacement and a {{{tp_init}}} wrapper, and then call the internal function directly, without doing any tuple packing etc. Not sure if it's worth it, though, as the call is already preceded by an (expensive) object allocation."	enhancement	new	major	wishlist	Optimization