make encoder output large uints as string, and fix ssz suite config setting

test_generators/ssz_static/main.py

@@ -51,7 +51,7 @@ def get_ssz_suite(seed: int, config_name: str, mode: random_value.RandomizationM
             summary="Test suite for ssz serialization and hash-tree-root",
             forks_timeline="testing",
             forks=["phase0"],
-            config="minimal",
+            config=config_name,
             runner="ssz",
             handler="static",
             test_cases=ssz_static_cases(rng, mode, chaos, count)))

test_libs/pyspec/eth2spec/debug/encode.py

@@ -3,6 +3,8 @@ from eth2spec.utils.minimal_ssz import hash_tree_root
 
 def encode(value, typ, include_hash_tree_roots=False):
     if isinstance(typ, str) and typ[:4] == 'uint':
+        if typ[4:] == '128' or typ[4:] == '256':
+            return str(value)
         return value
     elif typ == 'bool':
         assert value in (True, False)