This seems to work for both cases:

#(.createWithCheck PersistentHashMap (into-array %&))

this is because regular CLJS still treats every symbol with a dot as valid. no checks whatsoever.

shadow checks a bit more and I guess misses something?

it seems shadow resolves PersistentHashSet against the current namespace and not first against core (in this particular case)

it's a minor issue, I already worked around this, but would be nice if shadow had the same behavior as vanilla CLJS here

it is odd that it works with the standalone version, i.e. PersistentHashSet alone

so I'm guessing there is a problem in the desugaring code for that

feel free to open an issue for this. can't dig deeper currently.

👍

https://github.com/thheller/shadow-cljs/issues/1198