fix int encoding, fix list randomization size limit.

test_libs/pyspec/eth2spec/debug/encode.py

@@ -8,8 +8,8 @@ def encode(value: SSZValue, include_hash_tree_roots=False):
     if isinstance(value, uint):
         # Larger uints are boxed and the class declares their byte length
         if value.type().byte_len > 8:
-            return str(value)
-        return value
+            return str(int(value))
+        return int(value)
     elif isinstance(value, Bit):
         return value == 1
     elif isinstance(value, list):  # normal python lists, ssz-List, Vector

test_libs/pyspec/eth2spec/debug/random_value.py

@@ -95,6 +95,9 @@ def get_random_ssz_object(rng: Random,
         elif mode == RandomizationMode.mode_max_count:
             length = max_list_length
 
+        if typ.length < length:  # SSZ imposes a hard limit on lists, we can't put in more than that
+            length = typ.length
+
         return typ(
             get_random_ssz_object(rng, typ.elem_type, max_bytes_length, max_list_length, mode, chaos)
             for _ in range(length)