silence compiler warnings on -Wsign-conversion #109
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silence some warnings by implicit cast to correct sign
for ppl who use -Wconversion or just -Wsign... flags
first PR, so tell me if i did something wrong
no tests, because idk how to properly setup compiler flag test
(i probably can write cpp file that use std::system to call clang++, g++, etc with flags) <- if its ok, i can do it