Fix and un-allow `trivial_numeric_casts` lints #762

Job	Run time
cargo check (msrv) (android) (armv7-linux-androideabi)	24s
cargo check (msrv) (windows-latest)	1m 0s
cargo check (msrv) (android) (aarch64-linux-android)	44s
cargo clippy (windows-latest)	27s
cargo clippy (android) (armv7-linux-androideabi)	54s
cargo check (msrv) (macos-latest)	49s
cargo clippy (macos-latest)	25s
cargo check (msrv) (android) (x86_64-linux-android)	42s
cargo check (msrv) (ubuntu-latest)	24s
cargo clippy (ubuntu-latest)	23s
cargo clippy (android) (aarch64-linux-android)	1m 43s
cargo clippy (android) (x86_64-linux-android)	1m 34s
formatting	21s
cargo doc (windows-latest)	1m 47s
cargo test (windows-latest)	1m 28s
cargo doc (macos-latest)	23s
cargo test (macos-latest)	33s
typos	4s
cargo doc (ubuntu-latest)	23s
cargo test (ubuntu-latest)	28s
	14m 56s

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