Indexmap's MutableKeys trait allows one to mutate the keys in an IndexMap, however it doesn't prevent bugs where the new keys have different hash values from the old keys. Since I recently made this mistake, add an assert to help catch such bugs. It doesn't always catch the bug, because whether or not the bug is observable depends on hashmap internals, but it's better than nothing.
Indexmap's
MutableKeystrait allows one to mutate the keys in anIndexMap, however it doesn't prevent bugs where the new keys have different hash values from the old keys. Since I recently made this mistake, add an assert to help catch such bugs. It doesn't always catch the bug, because whether or not the bug is observable depends on hashmap internals, but it's better than nothing.