typst content.at() will always check 'default' even if the given field exists

minimal_test.typ

#let get_text(knt) = {
  let temp = knt.at("body", default: false)
  if temp == false { temp = knt.at("text") }
  temp
}
#let get_text2(knt) = {
  knt.at("body", default: knt.at("text", default: "anything"))
}
#let get_text3(knt) = {
  knt.at("body", default: knt.at("text"))
  // error: content does not contain field "text" and no default value was specified
}
#get_text([*20*])

#get_text([20])

#get_text2([*20*])

#get_text2([20])

#get_text3([*20*])

#get_text3([20])

#[func]
pub fn at(
    &self,
    /// The field to access.
    field: Str,
    /// A default value to return if the field does not exist.
    #[named]
    default: Option<Value>,
) -> StrResult<Value> {
    let Some(id) = self.elem().field_id(&field) else {
        return default.ok_or_else(|| missing_field_no_default(&field));
    };
    self.get(id)
        .or(default)
        .ok_or_else(|| missing_field_no_default(&field))
}

There may be no simple way to fix that because default has been calculated into a Value before the function at is called.
I think knt.at("body").or(something_default) (actually or_else) is "the rust way", and it can avoid this problem caused by evaluation strategy.