New comment by tornaria on void-packages repository

https://github.com/void-linux/void-packages/pull/34030#issuecomment-1000894040

Comment:
Using this patch
```diff
--- a/src/sage/rings/integer.pyx	2021-12-12 07:19:28.000000000 -0300
+++ b/src/sage/rings/integer.pyx	2021-12-24 13:09:22.860265615 -0300
@@ -4475,10 +4475,19 @@
 
         cdef Integer z = PY_NEW(Integer)
 
+        cdef mpz_ptr zz
+        zz = <mpz_ptr>(z.value)
+        print(zz._mp_alloc, zz._mp_size, <long>zz._mp_d)
+        print([(<unsigned long *>zz._mp_d)[i] for i in range(zz._mp_size)])
+
         sig_on()
         mpz_fac_ui(z.value, mpz_get_ui(self.value))
         sig_off()
 
+        zz = <mpz_ptr>(z.value)
+        print(zz._mp_alloc, zz._mp_size, <long>zz._mp_d)
+        print([(<unsigned long *>zz._mp_d)[i] for i in range(zz._mp_size)])
+
         return z
 
     def multifactorial(self, long k):
```

I get
```sage
sage: sage.rings.integer.Integer.factorial(26)
2 0 94045612553408
[]
2 2 94045612553408
[16877220553537093632, 21862473]
403291461126605635584000000
sage: sage.rings.integer.Integer.factorial(27)
2 0 94045618588208
[]
3 2 94045618588208
[12963097176472289280, 590286795]
10888869450418352160768000000
```
Note: the `940456...` are allocated pointers, so random; everything else should be similar I guess.

Note 2: if you already have sage compiled, you can just patch the file and run `./sage -br` to recompile just this file. Not in the system installed version because that's readonly, but it works ok in the chroot.