Introduce checked functions for pushing, joining, and switching encodings #85

Job	Run time
Verify code formatting (windows-latest)	23s
Verify code formatting (ubuntu-latest)	6s
Run examples using Rust stable (ubuntu-latest)	10s
Lint with clippy (windows-latest, --all-features)	35s
Test Rust stable (windows-latest, x86_64-pc-windows-msvc --all-features)	1m 26s
Lint with clippy (windows-latest, --no-default-features)	1m 7s
Test Rust stable (windows-latest, x86_64-pc-windows-msvc --no-default-features)	1m 51s
Test Rust stable (macos-latest, --all-features)	1m 28s
Lint with clippy (ubuntu-latest, --all-features)	12s
Test Rust stable (macos-latest, --no-default-features)	30s
Lint with clippy (ubuntu-latest, --no-default-features)	14s
Test Rust stable (ubuntu-latest, --all-features)	26s
Test Rust stable (ubuntu-latest, --no-default-features)	30s
Test Rust stable (ubuntu-latest, wasm32-unknown-unknown --all-features)	7s
Test Rust stable (ubuntu-latest, wasm32-unknown-unknown --no-default-features)	7s
Test Rust 1.58.1 (ubuntu-latest, --all-features)	39s
Test Rust 1.58.1 (ubuntu-latest, --no-default-features)	39s
	10m 30s

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