addRule to rule set.

AddRuleWithOrder to rule set with an order.

Given [ A, B, C ] return 'A, B, or C'.

Given [ A, B, C ] return '"A", "B", or "C"'.

Given an invalid input string and a list of valid options, returns a filtered list of valid options sorted based on their similarity with the input.

VariableValues coerces and validates variable values.