>     Treap _remap should return the ID of the mapping as a string
>   ․ Treap _remap should return the ID of the mapping as a string
>     Treap _remap should conflict if such mapping already exists
>   ․ Treap _remap should conflict if such mapping already exists
>     Treap _remap should conflict if such mapping already exists (non-empty case)
>   ․ Treap _remap should conflict if such mapping already exists (non-empty case)
>     Treap _remap should not conflict if given the old mapping ID
>   ․ Treap _remap should not conflict if given the old mapping ID
>     Treap _remap should not conflict if given the old mapping ID (non empty case)
>   ․ Treap _remap should not conflict if given the old mapping ID (non empty case)
>     Treap _remap should effect the inverse of what has been effected by a mapping when removed
>   ․ Treap _remap should effect the inverse of what has been effected by a mapping when removed
45c57
<   21 passing (2s)
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>   27 passing (2s)