úÎ’ºNoneOEvaluate an expression Example: `evaluate def "x + y ^ 2" [("x", 1), ("y", 2)]          'mathexpr-0.1.0.0-L2dCSLKCV329HzuJ0ora1Q Data.MathExprSettings operators functionsdefaultOperatorsdefaultFunctionsevaluate$fDefaultSettings toPostfixtokenizereplaceVariables alphanumericisAlphanumericisSymbol triLookuppad