ttl-core/src/main/java/com/alibaba/ttl3/transmitter/ThreadLocalTransmitRegistry.java [163:177]:
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            for (Map.Entry<ThreadLocal<Object>, Object> entry : captured.entrySet()) {
                final ThreadLocal<Object> threadLocal = entry.getKey();
                backup.put(threadLocal, threadLocal.get());

                final Object value = entry.getValue();
                if (value == threadLocalClearMark) threadLocal.remove();
                else threadLocal.set(value);
            }

            return backup;
        }

        @NonNull
        @Override
        public HashMap<ThreadLocal<Object>, Object> clear() {
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ttl2-compatible/src/main/java/com/alibaba/ttl/TransmittableThreadLocal.java [814:828]:
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                        for (Map.Entry<ThreadLocal<Object>, Object> entry : captured.entrySet()) {
                            final ThreadLocal<Object> threadLocal = entry.getKey();
                            backup.put(threadLocal, threadLocal.get());

                            final Object value = entry.getValue();
                            if (value == threadLocalClearMark) threadLocal.remove();
                            else threadLocal.set(value);
                        }

                        return backup;
                    }

                    @NonNull
                    @Override
                    public HashMap<ThreadLocal<Object>, Object> clear() {
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