Convert mpz to heap type

.github/workflows/ci.yml

@@ -17,7 +17,7 @@ jobs:
       fail-fast: true
       matrix:
         os: [ubuntu-24.04]
-        python-version: [3.9, '3.10', pypy3.11, graalpy-24.2,
+        python-version: [3.9, '3.10', pypy3.11-nightly, graalpy-24.2,
                          3.11, 3.12, 3.13, 3.13t, 3.14, 3.14t]
     runs-on: ${{ matrix.os }}
     env:

.github/workflows/coverage.yml

@@ -11,7 +11,7 @@ jobs:
       fail-fast: true
       matrix:
         os: [ubuntu-24.04]
-        python-version: [pypy3.11, "3.x", 3.14]
+        python-version: [pypy3.11-nightly, "3.x", 3.14]
     steps:
       - uses: actions/checkout@v4
         with:

fmt.c

@@ -939,6 +939,7 @@ format_long_internal(MPZ_Object *value, const InternalFormatSpec *format)
     Py_ssize_t prefix = 0;
     NumberFieldWidths spec;
     int32_t x = -1;
+    gmp_state *state = PyType_GetModuleState(Py_TYPE(value));
 
     /* Locale settings, either from the actual locale or
        from a hard-code pseudo-locale */
@@ -1025,7 +1026,7 @@ format_long_internal(MPZ_Object *value, const InternalFormatSpec *format)
         if (format->sign != '+' && format->sign != ' '
             && format->width == -1 && format->type != 'n'
             && !format->thousands_separators
-            && MPZ_CheckExact(value))
+            && MPZ_CheckExact(state, value))
         {
             /* Fast path */
             return MPZ_to_str(value, base, format->alternate ? OPT_PREFIX : 0);