fix

scripts/fuzz_opt.py

diff --git a/scripts/fuzz_opt.py b/scripts/fuzz_opt.py
index 2670160..619ef3c 100755
--- a/scripts/fuzz_opt.py
+++ b/scripts/fuzz_opt.py
@@ -35,7 +35,8 @@
 
 # parameters
 
-TYPE_SYSTEM_FLAG = '--hybrid'
+# TODO: switch to --hybrid when that becomes the most common mode for users
+TYPE_SYSTEM_FLAG = '--nominal'
 
 # feature options that are always passed to the tools.
 CONSTANT_FEATURE_OPTS = ['--all-features']