refactor: simplify upsert operation #300
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This uses the rust-y `.entry().or_insert*()` [pattern](https://www.knowbe4.com/careers/blogs/engineering/on-rusts-map-entry-pattern) as an alternative to `.contains()` + `.insert()`, to express the "upsert" (insert or update) operation of a `BTreeMap` more concisely. I believe it preserves the original behavior.
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This uses the rust-y
.entry().or_insert*()pattern as an alternative to.contains()+.insert(), to express the "upsert" (insert or update) operation of aBTreeMapmore concisely.I believe it preserves the original behavior.