clarify how encoding works for deserialization too

..and be more specific about what an "array property" is

Author: karenetheridge

src/oas.md

@@ -1376,11 +1376,11 @@ Each field has its own set of media types with which it can be used; for all oth
 The behavior of the `encoding` field is designed to support web forms, and is therefore only defined for media types structured as name-value pairs that allow repeat values, most notably `application/x-www-form-urlencoded` and `multipart/form-data`.
 
 To use the `encoding` field, each key under the field MUST exist in the data instance as a property; `encoding` entries with no corresponding property SHALL be ignored.
-Array properties MUST be handled by applying the given Encoding Object to produce one encoded value per array item, each with the same `name`, as is recommended by [[!RFC7578]] [Section 4.3](https://www.rfc-editor.org/rfc/rfc7578.html#section-4.3) for supplying multiple values per form field.
-For all other value types for both top-level non-array properties and for values, including array values, within a top-level array, the Encoding Object MUST be applied to the entire value.
+When serializing, property values of the array type MUST be handled by applying the given Encoding Object to produce one encoded value per array item, each with the same `name`, as is recommended by [[!RFC7578]] [Section 4.3](https://www.rfc-editor.org/rfc/rfc7578.html#section-4.3) for supplying multiple values per form field; when deserializing, the Encoding object is applied to each item of the array property of the same name.
+For all other value types for both top-level non-array property values and for other values, including items of the array type within a top-level array, the Encoding Object MUST be applied to the entire value.
 The order of these name-value pairs in the target media type is implementation-defined when not explicitly defined by that media-type's specification.
 
-For `application/x-www-form-urlencoded`, the `encoding` keys MUST map to parameter names, with the values produced according to the rules of the [Encoding Object](#encoding-object).
+For `application/x-www-form-urlencoded`, the `encoding` keys MUST map to parameter names, with the serialized values produced according to the rules of the [Encoding Object](#encoding-object).
 See [Encoding the `x-www-form-urlencoded` Media Type](#encoding-the-x-www-form-urlencoded-media-type) for guidance and examples, both with and without the `encoding` field.
 
 For `multipart` types that decode to an object, such as `multipart/form-data`, the `encoding` keys MUST map to the [`name` parameter](https://www.rfc-editor.org/rfc/rfc7578#section-4.2) of the `Content-Disposition: form-data` header of each part, as is defined for `multipart/form-data` in [[!RFC7578]].