[Serializer] (re)document PRESERVE_EMPTY_OBJECTS #20877
Merged
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👋🏻
when implementing a web hook, I had to serialize en empty array as object, and found it was wrong (empty list not empty object)
this PR (re)adds this feature as I thinks its useful to have it directly showcased in the main doc
weirdly it was present in v5.4 #16977