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BTreeMap: make Ord bound explicit, compile-test its absence Most `BTreeMap` and `BTreeSet` members are subject to an `Ord` bound but a fair number of methods are not. To better convey and perhaps later tune the `Ord` bound, make it stand out in individual `where` clauses, instead of once far away at the beginning of an `impl` block. This PR does not introduce or remove any bounds. Also adds compilation test cases checking that the bound doesn't creep in unintended on the historically unbounded methods.