hey list,
If you look at the code, there is a function called _new_c() which is
used in the multiplication algorithm.
In there, the following line is called:
x = Matrix_integer_2x2.__new__(Matrix_integer_2x2,
self._parent, None, False, False)
this returns a Matrix_integer_2x2, but is different
The following curious bug came up during work on ticket #12233. For some
reason, if one creates a 2x2 integer matrix directly using the constructor
then it is possible to tell it to be immutable; but if one creates one via
arithmetic operations then calling "set_immutable" on it fails. Here's an
ex
