How to add a custom array-like field to a custom theorion box?

Questions
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3

Thank you @vmartel08 for the nudge in the right direction, I knew of sink arguments but couldn’t get it right the first time, so I did give it a second more careful try and ended up with a better result!

I replaced the suffix: (text:auto,fill: blue) with ...suffix I knew that from previous attempts,

yet I didn’t know how to set the defaults for the keys so I assumed I needed a lower level approach. But thanks to your insight, I realized that I missed the option default in definitions/methods like at() which allowed me to set keys with defaults, and now works as expected.

my latest attempt:

#let (mytheo-counter, mytheo-box, mytheo, show-mytheo) = make-frame(
  "theorem",
  "Theorem",
  counter: theorem-counter,
  inherited-levels: 2,
  inherited-from: heading,
  render: (
    prefix: auto,
    title: "",
    full-title: auto,
    ..suffix,
    body) => [
    #block(
      fill:blue.lighten(85%),
      inset: 0.5em,
      radius: 0.4em,
      )[
        *#full-title*
        #h(1fr)
        #{  
          if suffix.at("suffix", default: "") != "" {
            tag(fill: suffix.at("suffill", default: blue))[#suffix.at("suffix", default: "")]
            }
        }
        #linebreak()
        #body
      ]
    ]
)

#show: show-mytheo
    #mytheo(
      suffix:"important",
      suffill:red, //works as expected
      )[
      #lorem(5)
      ]

This for is more than acceptable, both the text are independent and fall back to defaults. But If you don’t mind me asking, what else do I need to utilize to approach the form suffix:(text:"important",) without triggering errors for not specifying the other key?