// Ladle._close calling it with art or ink as type(int128).min will crash
uint128 amt = _debtInBase(vault.seriesId, series, uint128(-art));
ilkJoin.exit(to, uint128(-ink))

// explanation
int128 art = type(int128).min; // -2^127
uint128 amt = uint128(-art); // this fails as -art=--2^127=2^127 cannot be represented in int128
