Taking a different approach of starting simple and working up,

100.0 works

{{100.0}} does not work

“{{100.0}}” also does not work

Combining this with similar comments, plus adding in the math to convert to a percent, I tried this:

brightness_pct: "{{state_attr('light.kitchen_sink_ceiling', 'brightness') | float(0) /255*100}}"

Still getting the same message

Message malformed: expected float for dictionary value @ data['brightness_pct']

For what it’s worth, if I try to set brightness instead of brightness_pct, I get a different message

Message malformed: extra keys not allowed @ data['brightness']

(I’m assuming that device just doesn’t accept a brightness attribute - not a big deal to math it out though)

Yesterday I accidentally commented in .ml and mentioned that voting third party in our current voting system is playing with fire to get a worse candidate in office. I was told I must therefore start a grassroots movement for ranked choice voting, because apparently I can’t have an opinion without a movement.

Normally I let a few downvotes get under my skin more than I care to admit, but in this setting it was kind of a badge of honor. Honestly it was kind of “fun” to see what people were saying.