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a5e68979ca
MSVC rightfully complained that there was some conversion from `size_t` to `unsigned int` that could come with a loss of data. This commit re-types the corresponding struct field `ctx_buffer::len` to `size_t`. Also, the function `ctx_buffer_append` has an integer return value which is supposed to be the (positive) length of the appended data on success, and a check is inserted that the data to be appended does not exceed MAX_INT in length.