* Now only swapping when needed. * Removed _addTokenTo and _removeTokenFrom * Removed removeTokenFrom test. * Added tests for ERC721 _mint and _burn * _burn now uses the same swap and pop mechanism as _removeFromOwner * Gas optimization on burn
* Now only swapping when needed. * Removed _addTokenTo and _removeTokenFrom * Removed removeTokenFrom test. * Added tests for ERC721 _mint and _burn * _burn now uses the same swap and pop mechanism as _removeFromOwner * Gas optimization on burn