code: public final AppendableAndOptions applyForJbcSrcStreaming(
        JbcSrcPluginContext context, Expression delegateAppendable, List<SoyExpression> args) {
      MethodRef sanitizerMethod = javaStreamingSanitizer;
      if (sanitizerMethod == null) {
        // lazily allocated
        sanitizerMethod =
            MethodRef.create(
                    Sanitizers.class,
                    name.substring(1) + "Streaming",
                    LoggingAdvisingAppendable.class)
                .asNonNullable();
        javaStreamingSanitizer = sanitizerMethod;
      }
      Expression streamingSanitizersExpr = sanitizerMethod.invoke(delegateAppendable);
      if (isCloseable()) {
        return AppendableAndOptions.createCloseable(streamingSanitizersExpr);
      } else {
        return AppendableAndOptions.create(streamingSanitizersExpr);
      }
    }
docs: Default implementation for {@link Streamable}.
  
  <p>Subclasses can simply add {@code implements Streamable} if they have an implementation in
  Sanitizers.<name>Streaming. If they don't, this method will throw while trying to find it.