docs: add note about array key type being ignored when serializing (#…

…1235) * docs: add note about array key type being ignored when serializing * Update annotations.rst Co-authored-by: Asmir Mustafic <[email protected]>
schmittjoh · Jul 13, 2020 · 11da161 · 11da161
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diff --git a/doc/reference/annotations.rst b/doc/reference/annotations.rst
@@ -444,6 +444,9 @@ Available Types:
 
 (*) If the standalone jms/serializer is used then default format is `\DateTime::ISO8601` (which is not compatible with ISO-8601 despite the name). For jms/serializer-bundle the default format is `\DateTime::ATOM` (the real ISO-8601 format) but it can be changed in `configuration`_.
 
+(**) The key type K for array-linke formats as ``array``. ``ArrayCollection``, ``iterable``, etc., is only used for deserialization, 
+for serializaiton is treated as ``string``.
+
 Examples:
 
 .. code-block :: php