Expressions
- Selectors as Expressions 
			 
Every selector is a conditional expression. A selector that evaluates to true matches the message; a selector that evaluates to false or unknown does not match.
 - Arithmetic Expression 
			 
Arithmetic expressions are composed of numeric literals, identifiers (that evaluate to numeric literals), arithmetic operations, and smaller arithmetic expressions.
 - Conditional Expression 
			 
Conditional expressions are composed of comparison operations, logical operations, and smaller conditional expressions.
 - Order of Evaluation 
			 
Order of evaluation is left-to-right, within precedence levels. Parentheses override this order.
 
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