Logging Intl.Locale objects omits the locale info

[lionel-rowe]

Default logging (console.log, repl, etc) for Intl.Locale objects looks like this:

> new Intl.Locale('zh-Hant-TW', { hourCycle: "h12" })
Locale [Intl.Locale] {}

Given that all information about an Intl.Locale is captured in its serialized form and that such serialized forms are typically short, it might make sense to log that info, something like this:

> new Intl.Locale('zh-Hant-TW', { hourCycle: "h12" })
Locale [Intl.Locale] { 'zh-Hant-TW-u-hc-h12' }

However, the full serialization is only available by calling toString, so possibly not appropriate for logging. Given that many common usages of locales don't use any of the extensions (calendar, hourCycle, etc.) simply showing the baseName might also suffice:

> new Intl.Locale('zh-Hant-TW', { hourCycle: "h12" })
Locale [Intl.Locale] { baseName: 'zh-Hant-TW' }

I guess there might be quite a few similar built-ins that don't have good logging in Deno (or Node for that matter) but could have properties exposed to logs to improve that experience. Obviously it makes sense to log things like file names for File objects (#20414 and #20415), but to what extent is it considered useful to do the same for APIs that might be less commonly used?