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feat: RBMap lemmas cont'd: find?_erase
- [x] Depends on: #735
- [x] Depends on: #737
- [x] Depends on: #738
- [x] Depends on: #739
- [x] Depends on: #740
Continuation of the RBMap series. This adds characterizing lemmas for erase, and RBMap versions of lowerBound? and upperBound?.