chore: simplify operands, extract more exec_ methods #626

Job	Run time
Build wasm	2m 9s
Run tests on Linux armv7	43s
Run tests on Linux arm64	57s
Run tests on Linux x86 (nightly)	50s
Run tests on macOS arm64 (Apple M1)	43s
Run tests on Linux x86 (nightly, no default features)	58s
Run tests on Linux x86 (stable, no default features)	35s
Run tests on Linux x86 (stable)	23s
	7m 18s

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