Prep for 7.7.3 release

Prep for 7.7.3 release

Prep for 7.7.2 release

Prep for 7.7.2 release

Merge code changes from upstream 7.7.1

Also sync shortnumberinfo.py more closely with upstream
ShortNumberInfo.java and friends (cf. commit 2f3fd02).

Merge code changes from upstream 7.7.1

Also sync shortnumberinfo.py more closely with upstream
ShortNumberInfo.java and friends (cf. commit 2f3fd02).

Don't propagate the special -1 value for possible_length

Don't propagate the special -1 value for possible_length

Fix generated metadata -- sorted possible_length

Fix generated metadata -- sorted possible_length