functions

type ExprTestCase struct {
	Expr     string
	Expected interface{}
	Inputs   map[string]any
}

type FunctionDefinition struct {
	Name      string
	Overloads []*OverloadDefinition
}

type OverloadDefinition struct {
	Operator   string
	Args       []*cel.Type
	ResultType *cel.Type
	Unary      functions.UnaryOp
	Binary     functions.BinaryOp
	TestCases  []*ExprTestCase
}