convertToString converts the input to a bool form: if already a bool, returns the same object, if it's a string, parse bool from it, otherwise error.

ReplaceParameter replaces all occurrences of "{{ paramName }}" in the input by paramValue.

ReplaceParameters traverses an arbitrarily complex input object (maps/slices/strings/etc.) and tries to replace parameters given as {{parameter}} with their values from the parameters map.

ValidParameters checks if parameter names are valid.