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* When there is buffered cleartext, return it without calling the underlying read function. This prevents buffer overflow due to space used up by cleartext. * Avoid clearing the buffer when the buffered cleartext could not be completely given to the result read buffer, and there is some buffered ciphertext left. * Instead of rounding up the amount of bytes to ask for to the nearest TLS record size, round down, with a minimum of 1. This prevents the code path from being taken which requires extra memory copies. * Avoid calling `@memcpy` with overlapping arguments. closes #15590