the `settings.json` required to have some actually usable inlay hint coloring. Why this isn't the default is beyond me.

VSCodeInlayHints.json

{
	"settings": {
		"workbench.colorCustomizations": {
			"editorInlayHint.foreground": "#868686f0", // Really light bluish
			"editorInlayHint.background": "#00000000", // Transparent Background
			// Overrides for specific kinds of inlay hints
			"editorInlayHint.typeForeground": "#868686f0",
			"editorInlayHint.parameterForeground": "#868686f0",
	
			"editorInlayHint.parameterBackground": "#00000000",
			"editorInlayHint.typeBackground": "#00000000",
		},
	}
}