func (u LedgerKey) ArmForSwitch(sw int32) (string, bool) {
	switch LedgerEntryType(sw) {
	case LedgerEntryTypeAccount:
		return "Account", true
	case LedgerEntryTypeTrustline:
		return "TrustLine", true
	case LedgerEntryTypeOffer:
		return "Offer", true
	case LedgerEntryTypeData:
		return "Data", true
	}
	return "-", false
}
func (u LedgerKey) ArmForSwitch(sw int32) (string, bool) {
	switch LedgerEntryType(sw) {
	case LedgerEntryTypeAccount:
		return "Account", true
	case LedgerEntryTypeTrustline:
		return "TrustLine", true
	case LedgerEntryTypeOffer:
		return "Offer", true
	case LedgerEntryTypeData:
		return "Data", true
	}
	return "-", false
}
// ArmForSwitch returns which field name should be used for storing
// the value for an instance of LedgerKey