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The new "keyword" "switch" causes multiple grammar ambiguities if used without restrictions. It has to be included in the list of reserved function names for let's say roughly the same reasons why "typeswitch" is already there.
Quite right. I've added it to the list in appendix A.3. (Similarly, I also added "namespace-node".) Consequently, I'm marking this issue as resolved-FIXED. Please mark it CLOSED to signal your agreement.
Thank you.