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It states that an operation's arguments should contain only operands — understood as information necessary to its operation — and not options — understood as auxiliary information. Options are supposed to be set in separate operations.
The motivations for this are:
- Ease of learning: Beginners do not have to concern themselves with setting options.
- Wide spectrum coverage: Experts can still set options using the auxiliary operations.
- Evolution. Options are more likely to change than operands, so the parameter list to the operation remains more stable.