Now I've discovered that for cache groups the value can be a String[], so perhaps <String, Object> is more suitable. Does that sound reasonable? Are they used in others ways? This is the difference between code I'd be writing for myself (where I'd make it really tightly defined for compile time safety) and a public library where others may want to override the public functions.
Whatever it is, I'd like to document more clearly what these properties can represent (for example, will the key become an enum one day?)
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