Enum ordinals, inlay for the inLAY-Z - an IntelliJ Platform plugin.
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Using IDE built-in plugin system:
Settings/Preferences > Plugins > Marketplace > Search for "inlay-enum-ordinals" > Install Plugin
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Manually:
Download the latest release and install it manually using Settings/Preferences > Plugins > ⚙️ > Install plugin from disk...
Plugin based on the IntelliJ Platform Plugin Template.