address review: add asserts

Author: skirpichev

Modules/_decimal/_decimal.c

@@ -2340,7 +2340,12 @@ dec_from_long(decimal_state *state, PyTypeObject *type, PyObject *v,
         const uint8_t sign = export_long.negative ? MPD_NEG : MPD_POS;
         const Py_ssize_t len = export_long.ndigits;
 
-        if (base > UINT16_MAX) {
+        assert(layout->bits_per_digit <= 32);
+        assert(layout->digits_order == -1);
+        assert(layout->digit_endianness == (PY_LITTLE_ENDIAN ? -1 : 1));
+        assert(layout->digit_size == 2 || layout->digit_size == 4);
+
+        if (layout->digit_size == 4) {
             mpd_qimport_u32(MPD(dec), export_long.digits, len, sign,
                             base, ctx, status);
         }