Github user zhengruifeng commented on the issue:
https://github.com/apache/spark/pull/23144
I am not sure about `$$` or `%%`, we can replace them with other names.
I want to resolve the confusion of case-insensitivity, and wonder whether a
new flag can do this.
If we want to keep the return of getter identical to value passed to
setter, we will need two version of 'getter', one to return the original value,
the other to return the lower/upper value.
Another issue is that, there is no `StringParam` trait, so we have to
modify `Param` trait directly.
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