diff --git a/inkcpp/numeric_operations.h b/inkcpp/numeric_operations.h
index 489919b4..d2593139 100644
--- a/inkcpp/numeric_operations.h
+++ b/inkcpp/numeric_operations.h
@@ -116,6 +116,7 @@ namespace casting
 			// int value can cast to float
 			case value_type::int32: return static_cast<float>(v.get<value_type::int32>());
 			case value_type::uint32: return static_cast<float>(v.get<value_type::uint32>());
+			case value_type::boolean: return v.get<value_type::boolean>() ? 1.0f : 0.0f;
 			default: inkFail("invalid numeric_cast!"); return 0;
 		}
 	}
diff --git a/inkcpp/operations.h b/inkcpp/operations.h
index 48080beb..7546a015 100644
--- a/inkcpp/operations.h
+++ b/inkcpp/operations.h
@@ -86,15 +86,16 @@ template<typename... T>
 ink::runtime::internal::value
     ink::runtime::internal::value::redefine(const value& oth, T&... env) const
 {
-	if (type() != oth.type() && (type() == value_type::list_flag || type() == value_type::list)
-	    && (oth.type() == value_type::list_flag || oth.type() == value_type::list)) {
-		/// @todo could break origin
-		if (oth.type() == value_type::list) {
-			return value{}.set<value_type::list>(oth.get<value_type::list>());
-		} else {
-			return value{}.set<value_type::list_flag>(oth.get<value_type::list_flag>());
-		}
+	if (type() != oth.type()) {
+
+		const value vs[] = {*this, oth};
+		inkAssert(
+			casting::common_base<2>(vs) != value_type::none, 
+			"try to redefine value of other type with no cast available"
+		);
+
+		// There's a valid conversion, so redefine as input value.
+		return oth;
 	}
-	inkAssert(type() == oth.type(), "try to redefine value of other type");
 	return redefine<value_type::OP_BEGIN, T...>(oth, {&env...});
 }