feat: Initial changes from -Wconversion warnings #446

Job	Run time
Windows MSVC x64	1m 2s
Windows MSVC x86	1m 11s
Windows GCC	1m 43s
Windows Clang	2m 46s
Ubuntu GCC	31s
Ubuntu Clang	32s
Manylinux GCC	1m 30s
MUSL Cross Compile x86_64	45s
MUSL Cross Compile i686	1m 46s
MUSL Cross Compile aarch64	54s
MUSL Cross Compile armv7l	1m 53s
MUSL Cross Compile armv6	1m 56s
MUSL Cross Compile armv5l	49s
MUSL Cross Compile powerpc64	49s
MUSL Cross Compile powerpc64le	59s
	19m 6s

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