Type propagation issue in haxe/java

[delahee]

Hey Haxe Java Team <3

I stumbled on a type propagation issue on this :
HaxeFoundation/hscript#68 (comment)

It seems the duplicate() stuff return type is badly inferred only in java.
Should be either the one inferred from T or the one inferred from the affected variables but here it was demoted to

I haven't toyed with haxe java yet so if you need a reproducible examples let me know.

Cheers.

[kevinresol]

Is this related? #5953

[Simn]

The original PR unfortunately has conflicts, so I cannot check if it works.