Module serde_with::rust::sets_first_value_wins

Ensure that the first value is taken, if duplicate values exist

By default serde has a last-value-wins implementation, if duplicate keys for a set exist. Sometimes the opposite strategy is desired. This helper implements a first-value-wins strategy.

The implementation supports both the HashSet and the BTreeSet from the standard library.

Functions

deserialize

Deserialize a set and return an error on duplicate values