For most of those the behaviour isn't set in stone, though at the moment
of making that commit we're more or less sure that it's reasonable.
Behaviour in some cases might be more strictly enforces (as much as you
can enforce something in esoteric cases with misconfigured project
sturcture). Those are marked with comments with '!'.
Note the behaviour in 'precisePlatformsWithUnrelatedModuleHmpp': it is
incorrect, as set of platforms still contains unrelated platforms.
This is because in the current solution, some source-sets
(commonMain/commonTest) always receive COMMON platform and then it gets
coerced to set of targets actually seen in the project.This helps if
projects uses as much targets as current module (like in
precisePlatformsHmpp), but fails if it uses more targets than the
current module (like in precisePlatformsWithUnrelatedModuleHmppp)
The upcoming commits will fix that issue
Dmitry Savvinov