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Brian Clozel
ab8de8ec4b
Prior to this commit, the `FormHttpMessageConverter` would only support `MultiValueMap` payloads for reading and writing. While this can be useful when web forms contain multiple values under the same key, this prevent developers from using a common `Map` type and factory methods like `Map.of(...)`. This commit relaxes constraints in `FormHttpMessageConverter` and ensures that `Map` types are supported for reading and writing URL encoded forms. Note that when reading forms to a `Map`, only the first value for each key will be considered and other values will be dropped if they exist. Closes gh-36408