Fix question marks #874

Job	Run time
Test features	40s
Clippy	15s
Doc tests	29s
Minimal crates versions (stable, ubuntu)	26s
Minimal crates versions (stable, macOS)	29s
rustfmt	13s
Minimal crates versions (stable, windows)	1m 18s
Test Rust stable on ubuntu	19s
Test Rust stable on macOS	21s
Test Rust stable on windows	56s
Test Rust nightly on ubuntu	21s
Test Rust nightly on macOS	27s
Test Rust nightly on windows	46s
Test Rust 1.65.0 on ubuntu	1m 21s
Test Rust 1.65.0 on macOS	1m 27s
Test Rust 1.65.0 on windows	2m 6s
	11m 54s

Provide feedback