Fix and un-allow `trivial_numeric_casts` lints #765

Job	Run time
cargo clippy (windows-latest)	1m 59s
cargo clippy (android) (armv7-linux-androideabi)	1m 1s
cargo check (msrv) (android) (armv7-linux-androideabi)	20s
cargo check (msrv) (windows-latest)	1m 7s
cargo clippy (macos-latest)	51s
cargo clippy (android) (aarch64-linux-android)	1m 47s
cargo check (msrv) (android) (aarch64-linux-android)	43s
cargo check (msrv) (macos-latest)	32s
cargo clippy (android) (x86_64-linux-android)	1m 31s
cargo clippy (ubuntu-latest)	57s
cargo check (msrv) (android) (x86_64-linux-android)	44s
cargo check (msrv) (ubuntu-latest)	23s
formatting	22s
cargo doc (windows-latest)	1m 19s
typos	3s
cargo test (windows-latest)	1m 40s
cargo doc (macos-latest)	22s
cargo test (macos-latest)	34s
cargo test (ubuntu-latest)	30s
cargo doc (ubuntu-latest)	18s
	17m 3s

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