ttl-core/src/main/java/com/alibaba/ttl3/TtlCallable.java [138:147]:
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    public static <T> TtlCallable<T> get(@Nullable Callable<T> callable, boolean releaseTtlValueReferenceAfterCall, boolean idempotent) {
        if (callable == null) return null;

        if (callable instanceof TtlEnhanced) {
            // avoid redundant decoration, and ensure idempotency
            if (idempotent) return (TtlCallable<T>) callable;
            else throw new IllegalStateException("Already TtlCallable!");
        }
        return new TtlCallable<>(callable, releaseTtlValueReferenceAfterCall);
    }
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ttl2-compatible/src/main/java/com/alibaba/ttl/TtlCallable.java [153:162]:
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    public static <T> TtlCallable<T> get(@Nullable Callable<T> callable, boolean releaseTtlValueReferenceAfterCall, boolean idempotent) {
        if (callable == null) return null;

        if (callable instanceof TtlEnhanced) {
            // avoid redundant decoration, and ensure idempotency
            if (idempotent) return (TtlCallable<T>) callable;
            else throw new IllegalStateException("Already TtlCallable!");
        }
        return new TtlCallable<>(callable, releaseTtlValueReferenceAfterCall);
    }
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