More consistent handling of trailing slashes

[purplezimmermann]

Is your feature request related to a problem?

It’s a follow-up to #1542 –& I hope it doesn’t get nitpicky ;) – these issues just pop up in my unit tests ... I’ve also realized that I’m essentially re-opening #153 w/ this:

>>> URL('http://github.com') == URL('http://github.com/')
True

>>> str(URL('http://github.com')) == str(URL('http://github.com/'))
False

Describe the solution you'd like

Remove trailing slashes in .__str__() conversion – or completely, as proposed in #153 (comment)

>>> str(URL('http://github.com/'))
'http://github.com'

Describe alternatives you've considered

Using direct URL comparison – which leads me back to #1542 ;)

Additional context

No response

Code of Conduct

• I agree to follow the aio-libs Code of Conduct

[purplezimmermann]

To provide a little more problem context: I use yarl.URL in tandem w/ pydantic.AnyUrl for data validation – converting between them –& the latter always automatically adds a trailing root slash ...

More info on AnyUrl: https://docs.pydantic.dev/latest/api/networks/#pydantic.networks.AnyUrl