Allow allowReserved everywhere

The restriction on `allowReserved` make some useful configurations
impossible, and do not actually prevent pathological scenarios
like path parameter values containing `/`, from occurring.  Such
pathological scenarios are already possible by using `content`
instead of `style`/`explode`/`allowReserved`.

Lifting the restriction also makes the handling of this field
more consistent.

Author: handrews

src/oas.md

@@ -944,7 +944,7 @@ Serializing with `schema` is NOT RECOMMENDED for `in: "cookie"` parameters, `in:
 | ---- | :----: | ---- |
 | <a name="parameter-style"></a>style | `string` | Describes how the parameter value will be serialized depending on the type of the parameter value. Default values (based on value of `in`): for `"query"` - `"form"`; for `"path"` - `"simple"`; for `"header"` - `"simple"`; for `"cookie"` - `"form"`. |
 | <a name="parameter-explode"></a>explode | `boolean` | When this is true, parameter values of type `array` or `object` generate separate parameters for each value of the array or key-value pair of the map. For other types of parameters this field has no effect. When [`style`](#parameter-style) is `"form"`, the default value is `true`. For all other styles, the default value is `false`. Note that despite `false` being the default for `deepObject`, the combination of `false` with `deepObject` is undefined. |
-| <a name="parameter-allow-reserved"></a>allowReserved | `boolean` | When this is true, parameter values are serialized using reserved expansion, as defined by [RFC6570](https://datatracker.ietf.org/doc/html/rfc6570#section-3.2.3), which allows [RFC3986's reserved character set](https://datatracker.ietf.org/doc/html/rfc3986#section-2.2), as well as percent-encoded triples, to pass through unchanged, while still percent-encoding all other disallowed characters (including `%` outside of percent-encoded triples). Applications are still responsible for percent-encoding reserved characters that are [not allowed in the query string](https://datatracker.ietf.org/doc/html/rfc3986#section-3.4) (`[`, `]`, `#`), or have a special meaning in `application/x-www-form-urlencoded` (`-`, `&`, `+`); see Appendices [C](#appendix-c-using-rfc6570-based-serialization) and [E](#appendix-e-percent-encoding-and-form-media-types) for details. This field only applies to parameters with an `in` value of `query`. The default value is `false`. |
+| <a name="parameter-allow-reserved"></a>allowReserved | `boolean` | When this is true, parameter values are serialized using reserved expansion, as defined by [RFC6570](https://datatracker.ietf.org/doc/html/rfc6570#section-3.2.3), which allows [RFC3986's reserved character set](https://datatracker.ietf.org/doc/html/rfc3986#section-2.2), as well as percent-encoded triples, to pass through unchanged, while still percent-encoding all other disallowed characters (including `%` outside of percent-encoded triples). Applications are still responsible for percent-encoding reserved characters that are not allowed by the rules of the `in` destination or media type, or are [not allowed in the path by this specification](#path-templating); see Appendices [C](#appendix-c-using-rfc6570-based-serialization) and [E](#appendix-e-percent-encoding-and-form-media-types) for details. The default value is `false`. |
 | <a name="parameter-schema"></a>schema | [Schema Object](#schema-object) | The schema defining the type used for the parameter. |
 | <a name="parameter-example"></a>example | Any | Example of the parameter's potential value; see [Working With Examples](#working-with-examples). |
 | <a name="parameter-examples"></a>examples | Map[ `string`, [Example Object](#example-object) \| [Reference Object](#reference-object)] | Examples of the parameter's potential value; see [Working With Examples](#working-with-examples). |
@@ -1564,7 +1564,7 @@ See [Appendix B](#appendix-b-data-type-conversion) for a discussion of data type
 | ---- | :----: | ---- |
 | <a name="encoding-style"></a>style | `string` | Describes how a specific property value will be serialized depending on its type. See [Parameter Object](#parameter-object) for details on the [`style`](#parameter-style) field. The behavior follows the same values as `query` parameters, including default values. Note that the initial `?` used in query strings is not used in `application/x-www-form-urlencoded` message bodies, and MUST be removed (if using an RFC6570 implementation) or simply not added (if constructing the string manually). This field SHALL be ignored if the media type is not `application/x-www-form-urlencoded` or `multipart/form-data`. If a value is explicitly defined, then the value of [`contentType`](#encoding-content-type) (implicit or explicit) SHALL be ignored. |
 | <a name="encoding-explode"></a>explode | `boolean` | When this is true, property values of type `array` or `object` generate separate parameters for each value of the array, or key-value-pair of the map. For other types of properties this field has no effect. When [`style`](#encoding-style) is `"form"`, the default value is `true`. For all other styles, the default value is `false`. Note that despite `false` being the default for `deepObject`, the combination of `false` with `deepObject` is undefined. This field SHALL be ignored if the media type is not `application/x-www-form-urlencoded` or `multipart/form-data`. If a value is explicitly defined, then the value of [`contentType`](#encoding-content-type) (implicit or explicit) SHALL be ignored. |
-| <a name="encoding-allow-reserved"></a>allowReserved | `boolean` | When this is true, parameter values are serialized using reserved expansion, as defined by [RFC6570](https://datatracker.ietf.org/doc/html/rfc6570#section-3.2.3), which allows [RFC3986's reserved character set](https://datatracker.ietf.org/doc/html/rfc3986#section-2.2), as well as percent-encoded triples, to pass through unchanged, while still percent-encoding all other disallowed characters (including `%` outside of percent-encoded triples). Applications are still responsible for percent-encoding reserved characters that are [not allowed in the query string](https://datatracker.ietf.org/doc/html/rfc3986#section-3.4) (`[`, `]`, `#`), or have a special meaning in `application/x-www-form-urlencoded` (`-`, `&`, `+`); see Appendices [C](#appendix-c-using-rfc6570-based-serialization) and [E](#appendix-e-percent-encoding-and-form-media-types) for details. The default value is `false`. This field SHALL be ignored if the media type is not `application/x-www-form-urlencoded` or `multipart/form-data`. If a value is explicitly defined, then the value of [`contentType`](#encoding-content-type) (implicit or explicit) SHALL be ignored. |
+| <a name="encoding-allow-reserved"></a>allowReserved | `boolean` | When this is true, parameter values are serialized using reserved expansion, as defined by [RFC6570](https://datatracker.ietf.org/doc/html/rfc6570#section-3.2.3), which allows [RFC3986's reserved character set](https://datatracker.ietf.org/doc/html/rfc3986#section-2.2), as well as percent-encoded triples, to pass through unchanged, while still percent-encoding all other disallowed characters (including `%` outside of percent-encoded triples). Applications are still responsible for percent-encoding reserved characters that are not allowed in the target media type; see Appendices [C](#appendix-c-using-rfc6570-based-serialization) and [E](#appendix-e-percent-encoding-and-form-media-types) for details. The default value is `false`. This field SHALL be ignored if the media type is not `application/x-www-form-urlencoded` or `multipart/form-data`. If a value is explicitly defined, then the value of [`contentType`](#encoding-content-type) (implicit or explicit) SHALL be ignored. |
 
 See also [Appendix C: Using RFC6570 Implementations](#appendix-c-using-rfc6570-based-serialization) for additional guidance, including on difficulties caused by the interaction between RFC6570's percent-encoding rules and the `multipart/form-data` media type.
 
@@ -2299,7 +2299,7 @@ The Header Object follows the structure of the [Parameter Object](#parameter-obj
 
 1. `name` MUST NOT be specified, it is given in the corresponding `headers` map.
 1. `in` MUST NOT be specified, it is implicitly in `header`.
-1. All traits that are affected by the location MUST be applicable to a location of `header` (for example, [`style`](#parameter-style)). This means that `allowEmptyValue` and `allowReserved` MUST NOT be used, and `style`, if used, MUST be limited to `"simple"`.
+1. All traits that are affected by the location MUST be applicable to a location of `header` (for example, [`style`](#parameter-style)). This means that `allowEmptyValue` MUST NOT be used, and `style`, if used, MUST be limited to `"simple"`.
 
 ##### Fixed Fields
 
@@ -3837,6 +3837,8 @@ This will expand to the result:
 [RFC6570](https://www.rfc-editor.org/rfc/rfc6570)'s percent-encoding behavior is not always appropriate for `in: "header"` and `in: "cookie"` parameters.
 In many cases, it is more appropriate to use `content` with a media type such as `text/plain` and require the application to assemble the correct string.
 
+In some cases, setting `allowReserved: true` will be sufficient to avoid incorret encoding, however many characters are still percent-encoded with this field enabled, so care must be taken to ensure no unexpected percent-encoding will take place.
+
 For both [RFC6265](https://www.rfc-editor.org/rfc/rfc6265) cookies and HTTP headers using the [RFC8941](https://www.rfc-editor.org/rfc/rfc8941) structured fields syntax, non-ASCII content is handled using base64 encoding (`contentEncoding: "base64"`).
 Note that the standard base64-encoding alphabet includes non-URL-safe characters that are percent-encoded by RFC6570 expansion; serializing values through both encodings is NOT RECOMMENDED.
 While `contentEncoding` also supports the `base64url` encoding, which is URL-safe, the header and cookie RFCs do not mention this encoding.

src/schemas/validation/schema.yaml

@@ -377,6 +377,9 @@ $defs:
             type: string
           explode:
             type: boolean
+          allowReserved:
+            default: false
+            type: boolean
         allOf:
           - $ref: '#/$defs/examples'
           - $ref: '#/$defs/parameter/dependentSchemas/schema/$defs/styles-for-path'
@@ -435,9 +438,6 @@ $defs:
                     - spaceDelimited
                     - pipeDelimited
                     - deepObject
-                allowReserved:
-                  default: false
-                  type: boolean
 
           styles-for-cookie:
             if: