XMLDecoder.DateDecodingStrategy commented and actual default do not match

[kamcma]

A couple of the XMLDecoder.DateDecodingStrategy cases describe themselves as the default:

XMLCoder/Sources/XMLCoder/Decoder/XMLDecoder.swift

Lines 17 to 23 in 394ddf6

	/// The strategy to use for decoding `Date` values.
	public enum DateDecodingStrategy {
	/// Defer to `Date` for decoding. This is the default strategy.
	case deferredToDate
	/// Decode the `Date` as a UNIX timestamp from a XML number. This is the default strategy.
	case secondsSince1970

The actual default is .secondsSince1970:

XMLCoder/Sources/XMLCoder/Decoder/XMLDecoder.swift

Lines 241 to 242 in 394ddf6

	/// The strategy to use in decoding dates. Defaults to `.secondsSince1970`.
	open var dateDecodingStrategy: DateDecodingStrategy = .secondsSince1970

I'm wondering if just the comment or the default value is wrong. XMLEncoder's default is .deferredToDate, which matches the behavior of JSONEncoder and JSONDecoder:

XMLCoder/Sources/XMLCoder/Encoder/XMLEncoder.swift

Lines 290 to 291 in 394ddf6

	/// The strategy to use in encoding dates. Defaults to `.deferredToDate`.
	open var dateEncodingStrategy: DateEncodingStrategy = .deferredToDate

Perhaps there is a reason the default date decoding and encoding strategies are different? If not, is the desired behavior that they both be .deferredToDate like JSONEncoder and JSONDecoder? Would it be considered a breaking change to make that fix?

(I should add this has not affected me in production, I have only recently begun exploring this library.)