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[mypyc] Don't explicitly assign
NULL
values in setup functions (#15379
) While investigating something unrelated I stumbled across the `*_setup` functions, and I noticed that they contain a lot of code that looks like this: ```c self->abc = NULL; self->xyz = NULL; // ... ``` Something told me that assigning `NULL` to a bunch of fields is propably not needed, and when looking at the docs for `tp_alloc()` I found this reference to [`allocfunc`](https://docs.python.org/3/c-api/typeobj.html#c.allocfunc), the typedef for `tp_alloc()`: > It should return a pointer to a block of memory of adequate length for the instance, suitably aligned, ***and initialized to zeros***, ... Emphasis is mine. Basically I added a simple check that removes lines that assigns `NULL` values in setup functions. This removes about ~4100 lines from the C file when self-compiling.
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