func (ps *PlatformStrings) Flat() []string {
	unique := make(map[string]struct{})
	for _, s := range ps.Generic {
		unique[s] = struct{}{}
	}
	for _, ss := range ps.OS {
		for _, s := range ss {
			unique[s] = struct{}{}
		}
	}
	for _, ss := range ps.Arch {
		for _, s := range ss {
			unique[s] = struct{}{}
		}
	}
	for _, ss := range ps.Platform {
		for _, s := range ss {
			unique[s] = struct{}{}
		}
	}
	flat := make([]string, 0, len(unique))
	for s := range unique {
		flat = append(flat, s)
	}
	sort.Strings(flat)
	return flat
}
func (ps *PlatformStrings) Flat() []string {
	unique := make(map[string]struct{})
	for _, s := range ps.Generic {
		unique[s] = struct{}{}
	}
	for _, ss := range ps.OS {
		for _, s := range ss {
			unique[s] = struct{}{}
		}
	}
	for _, ss := range ps.Arch {
		for _, s := range ss {
			unique[s] = struct{}{}
		}
	}
	for _, ss := range ps.Platform {
		for _, s := range ss {
			unique[s] = struct{}{}
		}
	}
	flat := make([]string, 0, len(unique))
	for s := range unique {
		flat = append(flat, s)
	}
	sort.Strings(flat)
	return flat
}
// Flat returns all the strings in the set, sorted and de-duplicated.