chore: simplify true and false builtins #892

Job	Run time
Source code checks (stable)	37s
Benchmarks	11m 15s
Source code checks (1.75.0)	29s
Build (x86_64/linux)	1m 54s
Build (aarch64/macos)	1m 46s
Check for unneeded dependencies	1m 2s
Build (aarch64/linux)	2m 6s
Test (linux/x86_64)	1m 39s
Test (macOS)	1m 34s
Build (wasm32/wasi-0.2)	1m 15s
Build (x86_64/windows)	2m 2s
OS target tests (Fedora/latest)	26s
OS target tests (Debian/latest)	14s
OS target tests (Arch Linux/latest)	18s
	26m 37s

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