docs: public static boolean isSpringELCompilerEnabled(final IEngineConfiguration configuration) {
          final Object enableSpringELCompiler =
                  configuration.getExecutionAttributes().get(ENABLE_SPRING_EL_COMPILER_ATTRIBUTE_NAME);
          if (enableSpringELCompiler == null) {
              return false;
          }
          if (!(enableSpringELCompiler instanceof Boolean)) {
              throw new TemplateProcessingException(
                      "A value for the \"" + ENABLE_SPRING_EL_COMPILER_ATTRIBUTE_NAME + "\" execution attribute " +
                      "has been specified, but it is not of the required type Boolean. " +
                      "(" + enableSpringELCompiler.getClass().getName() + ")");
          }
          return ((Boolean) enableSpringELCompiler).booleanValue();
      }