Stats by Activity By Date Range

I don't feel like the periodType=Activity is properly understood yet. Say if you use [url=http://www.bungie.net/Platform/Destiny/Stats/1/4611686018429389559/2305843009216933146/?modes=Strike&monthstart=2015-05&monthend=2015-06]Monthly[/url] you will get a separate "monthly" structure after the "allTime" structure in your response, however you only get the latter when you do a call with periodType=Activity. It's worth noting that leaving the periodType parameter blank and specifying a monthstart and monthend will still bring back a response with the "monthly" structure included. So is there perhaps something missing that is required to do a proper Activity response for [url=http://bungienetplatform.wikia.com/wiki/GetHistoricalStats]GetHistoricalStats[/url]? If you don't provide all the parameters for a certain periodType, it seems to just return the "allTime" data instead (ie setting it to monthly but not specifying a start and end month won't return any monthly stats). What good is getting the "fastestCompletion" for all activities in a certain mode? Is it not possible to break this down to a specific activity?