IStringMap converts v into a map[string]string, provided v is really a map[interface{}]interface{}.

IStringPairs converts islice into a [][]string, where each element is a 2-pair []string.

IStringSlice converts islice into a []string, provided islice is a []interface{}, or returns an empty slice if not.

StringSliceSet converts a []string into a map[string]bool where the keys in the map are values in the []string mapped to true.