Remove unnecessary casts and other fixes (#825) #376

Job	Run time
NIF 2.15 - aarch64-apple-darwin (macos-11 \| default)	36m 3s
NIF 2.15 - aarch64-unknown-linux-gnu (ubuntu-20.04 \| default)	9m 19s
NIF 2.15 - aarch64-unknown-linux-musl (ubuntu-20.04 \| default)	9m 8s
NIF 2.15 - x86_64-apple-darwin (macos-11 \| default)	32m 29s
NIF 2.15 - x86_64-pc-windows-gnu (windows-2022 \| default)	18m 59s
NIF 2.15 - x86_64-pc-windows-gnu (windows-2022 \| legacy_cpu)	19m 56s
NIF 2.15 - x86_64-pc-windows-msvc (windows-2019 \| default)	18m 32s
NIF 2.15 - x86_64-pc-windows-msvc (windows-2019 \| legacy_cpu)	17m 48s
NIF 2.15 - x86_64-unknown-freebsd (ubuntu-22.04 \| default)	9m 3s
NIF 2.15 - x86_64-unknown-freebsd (ubuntu-22.04 \| legacy_cpu)	8m 59s
NIF 2.15 - x86_64-unknown-linux-gnu (ubuntu-20.04 \| default)	8m 36s
NIF 2.15 - x86_64-unknown-linux-gnu (ubuntu-20.04 \| legacy_cpu)	8m 43s
NIF 2.15 - x86_64-unknown-linux-musl (ubuntu-20.04 \| default)	8m 52s
	3h 26m 27s

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