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𝗖𝗮𝗹𝗹𝗶𝗻𝗴 𝗮𝗹𝗹 𝗛𝗼𝗺𝗲 𝗔𝘀𝘀𝗶𝘀𝘁𝗮𝗻𝘁 𝘁𝗲𝗺𝗽𝗹𝗮𝘁𝗲 𝘄𝗶𝘇𝗮𝗿𝗱𝘀! 
I’m working on extending the template engine with some new functions, filters, and tests, for example:
flatten(list_of_lists) – Flattens nested lists into a single list combine(dict1, dict2, ...) – Merges multiple dictionaries together
Now, I need your input! 
What template functions, filters, or tests would make your automations easier?
@frenck I find the
(as_timestamp(now()) - as_timestamp(state_attr("automation.xxx", "last_triggered"), 0)
quite lengthy.
Could we get a "seconds_since()" (implied: relative to now) or a "timestamp_diff()" instead?
@larsmb @frenck I was about to say thanks but I can't think of anything, but yes date time manipulation would be lovely.
There may already be a better way of doing this, but I couldn't find it so I have this brute
{% set t = (as_local(now()) - as_local(as_datetime(states('input_datetime.dishwasher_start_time')))).total_seconds() -120 %}
@frenck two that I created for my instance was "floor_entities" and "floor_devices". Should be self explanatory. :)
@frenck My biggest #Jinja gripe, in HA context, is unavailable/unknown. Semantically these aren't really values. In creating a template sensor for the difference of two temperatures, I have to check for them, and in general there are a lot of if foo not unavailable and foo not unknown.
What I would like is propagation, so that any template whose output expression has used a variable that is unknown has value unknown, and then similarly for unavailable.