Apply strict spec option to CodegenConfig instance (#2814)

Author: jimschubert

Diff for: modules/openapi-generator/src/main/java/org/openapitools/codegen/config/CodegenConfigurator.java

@@ -541,6 +541,8 @@ public ClientOptInput toClientOptInput() {
         config.languageSpecificPrimitives().addAll(languageSpecificPrimitives);
         config.reservedWordsMappings().putAll(reservedWordMappings);
 
+        config.setStrictSpecBehavior(isStrictSpecBehavior());
+
         checkAndSetAdditionalProperty(apiPackage, CodegenConstants.API_PACKAGE);
         checkAndSetAdditionalProperty(modelPackage, CodegenConstants.MODEL_PACKAGE);
         checkAndSetAdditionalProperty(invokerPackage, CodegenConstants.INVOKER_PACKAGE);