Strange formatting of long show-set rule

[Andrew15-5]

#show heading.where(level: 2): set heading(numbering: (..n) => [#n.pos().at(1).])

with typstyle -c 80:

#show heading.where(level: 2): set heading(numbering: (
  ..n,
) => [#n.pos().at(1).])

I think it's much more readable to prefer first breaking by 1 parameter per line:

#show heading.where(level: 2): set heading(
  numbering: (..n) => [#n.pos().at(1).],
)

[Enter-tainer]

I'm not entirely sure what's happending but it looks like this falls into a special handling for single parameter function call. I will look into it later.