In#17783 we're revamping Serializer docs. This meta-issue lists all serializer-related issues that are still pending. That way we can quickly check them and see if we've already fixed them in the new docs or even if we can ignore them because they are not relevant for docs:

• (5.4)Add a setter on DateTimeNormalizer to change the default context at run… #16125
• (5.4)[Serializer] Save missing arguments in MissingConstructorArgumentsExcep… #15838
• (5.x)CSV-encoding header documentation seems to be a bit misleading #15243
• (5.2)[Serializer] fix denormalization of basic property-types in XML and CSV #14158
• (3.4)[Serializer] Add Support for object_to_populate in CustomNormalizer #8454
• (3.x)[Serializer] Document the custom normalizer options #7135