altrisi 889e3b6999 Replace usages of j.u.Stack with fastutil's ...

Java's is synchronized everywhere, reducing performance given we don't need it to be. It's recommended to use `Deque` as a replacement, but given we have fastutil's, we use those

Closes #1640

2023-01-24 13:46:53 +01:00

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carpet

Replace usages of j.u.Stack with fastutil's

2023-01-24 13:46:53 +01:00