BTreeMap: tag internal functions with preconditions as unsafe - #68418

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ssomers:btreemap_prefer_unsafe

Commits on Jan 21, 2020

Declare unsafe all functions that can't handle shared roots
ssomers
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182af10
Declare unsafe all functions that debug_assert something other than shared roots, or (fn insert) turn debug_assert into assert
ssomers
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cc9ae53