feat: an .else_eq theorem for sparse casesOn #11402
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This PR adds a realizable `.else_eq` theorems for sparse casesOn constructions, for rewriting the else case. This code was complicated by having to work around the kernel reduction issues in #11181 around `Nat.xor` etc.
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This PR adds a realizable
.else_eqtheorem for sparse casesOnconstructions, for rewriting the else case.
This code was complicated by having to work around the kernel reduction
issues in #11181 around
Nat.xoretc.