replace panics with no-ops on empty ranges #112
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Inserts and removals have a clear sensible behavior that should happen when something is done to an empty range: nothing. The range defines the set of keys that may change, so if the range is empty, no keys may change.
While I don't think there is anything else that could possibly happen in these cases, the more important outcome is that there is no longer a risk of random panics that cannot be caught at compile time.