@Suiseiseki @scathach @jeffcliff @p That (no ABI) requires a hosted language-based system in order to have adequate structured messaging capacity.

It also requires the language to have a fairly rich type-system, otherwise that will be a wasted effort and guest languages will yet again have to formulate supplementary interchange formats will all sorts of unwanted slowdowns as a result.

That being said, source availability is irrelevant to a program's nature as proprietary malware. Source-available proprietary malware is readily available.