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Wang Yuan authored
When I used C++ to develop a redis module. i used `string.data()` as the second parameter `ele` of `RedisModule_DigestAddStringBuffer`, but there is a warning, since we never change the `ele`, i think we should use `const char` for it. This PR adds const to just a handful of module APIs that required it, all not very widely used. The implication is a breaking change in terms of compilation error that's easy to resolve, and no ABI impact. The affected APIs are around Digest, Info injection, and Cluster bus messages.
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