Make host lowercasing consistent

[nvie]

There's a minor discrepancy in how the hostname is lowercased, based on which API you use.

Steps to replicate

This seems OK:

>>> url = furl('https://MyHostWithCaps.example.org')
>>> url.host
'myhostwithcaps.example.org'
>>> str(url)
'https://myhostwithcaps.example.org'

This seems not OK (or at least not consistent):

>>> url = furl('https://MyHostWithCaps.example.org')
>>> url.host = 'MyHostWithCaps.example.org'             # <- difference here!
>>> url.host
'MyHostWithCaps.example.org'
>>> str(url)
'https://MyHostWithCaps.example.org'

Expected result

The u.host property should always return a lowercased value.

Actual result

The u.host property can sometimes return a string with non-lowercase chars.

[gruns]

Wonderful catch.

Fixed in furl v0.4.95.

>>> import furl
>>> furl.__version__
'0.4.95'
>>> from furl import furl
>>> f = furl('https://MyHostWithCaps.example.org')
>>> f.url
'https://myhostwithcaps.example.org'
>>> f.host = 'MyHostWithCaps.example.org'
>>> f.url
'https://myhostwithcaps.example.org'

Upgrade with pip install furl -U.

Thank you for the thorough, detailed Issue and bringing this bug to my
attention, Vincent. Don't hesitate to let me know if there's anything else I can
do for you.

[nvie]

Thanks for the fix!