Populating more hostvars, including the hostname we already have

but still allowing tags and vars to take precedence.
It's probably better described here: http://docs.ansible.com/developing_inventory.html
I'm not trying to RTFM you, I swear :smiley_cat:  The `_meta` -&gt; `hostvars` key of the inventory JSON is special.  It's also potentially very big.  Being able to choose between an "all at once" inventory request and fetching the hostvars for each host on demand is a capability I wanted to support.