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CommandMergeTinyV2 doesn't like members with the same name but different descriptors
Proguard creates these when obfuscating, but it throws an exception when you try to merge two mappings by the obf names:
java.lang.IllegalStateException: Duplicate key net.fabricmc.stitch.commands.tinyv2.TinyField@4623e502
at net.fabricmc.stitch.commands.tinyv2.TinyClass.mapFieldsByFirstNamespace(TinyClass.java:63)
at net.fabricmc.stitch.commands.tinyv2.CommandMergeTinyV2.mergeClasses(CommandMergeTinyV2.java:190)
at net.fabricmc.stitch.commands.tinyv2.CommandMergeTinyV2.lambda$merge$0(CommandMergeTinyV2.java:140)
at net.fabricmc.stitch.commands.tinyv2.CommandMergeTinyV2.map(CommandMergeTinyV2.java:304)
at net.fabricmc.stitch.commands.tinyv2.CommandMergeTinyV2.merge(CommandMergeTinyV2.java:134)
at net.fabricmc.stitch.commands.tinyv2.CommandMergeTinyV2.run(CommandMergeTinyV2.java:118)
Concern