I discovered new slam bidding insights when kibitzing this hand recently on BBO. East-West were world-class players Robert Levin and Geoff Hampson.
East forced to game in spades with his Jacoby 2NT response. His hand was too good to make a splinter response of four clubs.
When East next asked about kings, West denied having any by jumping to six spades (East already knew about the king of spades from the RKCB inquiry). Eye opening slam bidding by EW.
*25 Conventions You Should Know by Barbara Seagram and Marc Smith, p. 86. Entire book is highly recommend: https://www.amazon.com/Bridge-Conventions-You-Should-Know/dp/189415407X
FYI nicesummary of RKCB http://web2.acbl.org/documentLibrary/play/Commonly_Used_Conventions/romankeycard.pdf
Levin also demonstrated how to play this well-bid hand. Here is his puzzle for you: How did Levin hold his heart losers to one after lead of a low diamond by North? I will get to that tomorrow.