Ensure boolean feature flags are booleans via CLI #3085

Job	Run time
Lint	1m 13s
Flow	1m 4s
TypeScript types	1m 53s
Benchmarks	22m 7s
Unit tests (ubuntu-latest, Node 18)	3m 10s
Unit tests (macos-latest, Node 18)	12m 26s
Unit tests (windows-latest, Node 18)	9m 58s
Integration tests (ubuntu-latest, Node 18)	7m 20s
Build REPL	10m 53s
Unit tests (ubuntu-latest, Node 20)	3m 4s
Integration tests (macos-latest, Node 18)	24m 31s
Unit tests (macos-latest, Node 20)	6m 12s
Integration tests (windows-latest, Node 18)	15m 36s
Unit tests (windows-latest, Node 20)	13m 9s
Integration tests (ubuntu-latest, Node 20)	6m 47s
Integration tests (macos-latest, Node 20)	24m 6s
Integration tests (windows-latest, Node 20)	15m 23s
	2h 58m 52s

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